Posts tagged mania

Why is the world vivid in mania, but bleak in depression?

Down in a hole
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No, I am not speaking metaphorically. Quite literally,there has been accumulating evidence that sense are sharpened and have great acuity in mania while they are dulled in depression and the effects can be seen within the same individual over time as he/she suffers from manic/depressive episodes.

The latest study to add to this literature is by Bubl et al that found that depressive people’s brain registered lesser contrast than that registered by normal control brains when presented with same black and white images. They used pattern electroretinogram (PERG) to find whether the contrast gains registered by depressive retinas (those suffering from MDD) were different from those of controls and they found a strong and significant association with the severity of the depression.

I have covered earlier studies that found that sense of taste was compromised in depression (and enhanced in mania) and similarly that the sense of smell showed similar effects. Some snippets from the earlier posts:

What this means is that if you increase the amount of serotonin in the brain, then the capacity to detect sweet and bitter tastes is increased; if you increase noradrenaline levels those of detecting salty and bitter tastes is augmented; while a general increase in anxiety leads to better bitter taste detection. This also means that an anxiety state produces more bitter taste perception whereas a depressive state (characterized by low serotonin) is marked by bland sense of taste with marked inability to detect sweet and bitter tastes. A stressed state , marked by abundance of noradrenaline, would however lead to more salty and bitter taste perception.

and…

In one of my earlier post on depression, I had commented on the fact that those suffering from depression have less sensitivity to sweet and bitter tastes and as such may compensate by eating more sugar thus leading to the well documented diabetes – depression linkage.

In a new study it has just been discovered that not only depressives have bland sense of taste, their sense of smell is also diminished and they may make compensations by using greater amounts of perfume. Overall it seems that those suffering from depression will have bland subjective experience of flavor(which is a combination of both smell and taste) and thus may even not really find what they eat to be tasty.

Further on, I speculate prophetically that blander vision will also be found:

To me, this is an important finding. To my knowledge no research has been done in other sense modalities (like vision), but there is every reason to think that we may discover a bland sense of vision in depression. Why do I surmise so? this is because there is extensive literature available regarding the manic state and how things seem ‘vivid’ during that state including visual vividness. If depression is the converse of Mania, it follows that a corresponding blandness of vision should also be observed in those who are clinically depressed.

We also know that in extreme or psychotic forms of Mania, auditory hallucinations may arise. I am not suggesting that hallucinations are equal to vividness, but I would definitely love to see studies determining whether the auditory sense is heightened in Mania (maybe more absolute pitch perception in Mania) and a corresponding loss of auditory absolute pitch perception in depression. If so found, it may happen that music literally becomes subdued for people with depression and they sort of do not hear the music present in everyday life!

Whether other sense like touch, vestibular/ kinesthetic , proprioception (a heightened sense of which may give rise to eerie out-pf-body experiences in Mania) are also diminished in depression is another area where research may be fruitful.

Of course I have also speculated about the others senses and would love to hear studies supporting/contradicting this thesis. But given that senses are attenuated in depression and exaggerated in mania the question remains why? Which brings me to the topic of this post- why is the world bleak /bland to a depressive and vivid for a manic?

This was also the question asked by Mark Changizi (@Mark_Changizi) on twitter with respect to this new study uncovered today and I replied that this may be due to broaden-and-build theory being applied to sensory domain or sensory gating phenomenon differentially acting in manic/ depressive states, while Mark was of the opinion that it might be the result of physiological arousal with arousal being the variable of interest controlling whether the sense remain acute or dull?

I do not see the two views necessarily contradictory and it may be that chronic affect per se activates arousal and that is the mediating variable involved in its effect on senses; and we can design experiments to resolve this by measuring the effect of state sadness/ happiness/arousal on visual acuity (if the effects of state manipulations are big enough); howsoever, I woudl like to elaborate on my broaden and build theory.

In the cognitive, psychological and psychosocial domains the broaden and build theory of positive affect is more or less clearly elaborated and delineated. I wish to extend this to the sensory domain. I propose that chronic positive affect signals to our bodies/brains that we can afford to make our attention more diffuse, let senses be perceived more vividly as we have more resources available to process incoming data; conversely in a chronic low affect state we might like to conserve resources by narrowing focus/ literally narrowing the range of sensory inputs/reducing the sensitivity of sense organs and pool those resources elsewhere.

I know this is just a hypothesis , but I am pretty convinced and would love to hear the results of experiments anyone conducts around this theory.
Bubl, E., Kern, E., Ebert, D., Bach, M., & Tebartz van Elst, L. (2010). Seeing Gray When Feeling Blue? Depression Can Be Measured in the Eye of the Diseased Biological Psychiatry, 68 (2), 205-208 DOI: 10.1016/j.biopsych.2010.02.009

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Am Manic, will focus; Am sad, will drift

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Lucky Guy Happy Gal... :-)
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Attention can be focused or it can be diffused. Attentional focus has been shown to be affected by mood or affect; with positive affect leading to a broadening of attentional focus;  and negative affect, in general been shown to be associated with a narrowing of focus.

However, Gable and Harmon-Jones argue that emotion or affect is not a uni-dimensional construct, but has at least two dimensions: affective valence- i.e. whether it is felt as pleasurable or dis-pleasurable; and motivational  direction- i.e. the action tendency to approach or avoid in pursuit of a preventive/promotional goal.

Much work on emotions has emphasized that they have a number of underlying dimensions. Two dimensions that have received considerable attention are affective valence, the felt pleasure or displeasure, and motivational direction, the action tendency associated with a particular emotional state—approach or withdrawal. Approach motivation refers to an urge or action tendency to go toward an object, whereas withdrawal motivation refers to an urge or action tendency to move away from an object.

They also argue that much of the extant literature on emotion-attention linkage has focused on emotional valence alone, with just one type of motivational direction, and thus has not clarified the (in)dependent role of valence and motivational direction as regards to attention.

Thus, for e.g., the finding that positive emotions lead to  broadening of attention is focused on such research as emotions of joy, contentment etc that are low in approach motivation and are emotions felt after the goal has been reached.

Similarly, the research that has found that negative emotions lead to narrowing of focus have relied on emotions such as fear, anger etc that are high in withdrawal motivation and are pre-goal.

I believe, it is important to step back a little here and go back to our conception of happiness-ennui (mental well-being) continuum and sadness-mania (mental illness) continuum. Another way to conceptualize them is to see sadness having negative valence and low withdrawal motivation – it is passive; mania as having positive valence and high approach motivation- mania is characterized by immense desire for a goal and is pre -goal. Happiness is post goal emotion and is characterized by positive valence and low approach motivation- you have already reached the goal and do not need to exert much efforts in goal directed activity; ennui/boredom/listlessness is negative in valence and has high withdrawal motivation- it is pre-goal- a search for a worthwhile goal.

Another way to make the difference stark is employ the terminology of Berridge et al: happiness is related to liking and the opioid system; while mania is related to wanting and the dopamine system.  Depression/sadness  is related to disliking /feeling pain while ennui/boredom is related to dreading the outcome/feeling anxious (nothing to do and hence life is useless/meaningless!..anxiety but existential anxiety). Berridghe et al have shown that wanting/liking and dreading/disliking differ and have different neural and neurochemichal correlates.

To become a little philosophical, the wanting/disliking  mental illness continuum leading to mania or depression in extremes is to be avoided (thus the dictum of all religions to shun desire/ be stoic) while the happiness-ennui/boredom/existential anxiety system is more preferable where you focus on liking positive outcomes and dreading negative/neutral ones. While the former, to paraphrase Freud,  is the hysterical misery at worst, the latter is common unhappiness at worst.

But anyway that was long detour. Lets get back to the studies by Gable et al.

In the first study, the authors showed that motivational direction was relevant and was the reason behind the positivity-broadening of attentional focus effect. they showed that positive emotions lead to broadening of attention only in low approach motivation condition; but when the positive emotion had high approach motivation (emotions like desire. engagement etc), the positive affect lead to narrowing of focus.

Now a brief detour into methodology: the attentional focus is usually measured using local-global tasks whereby it is determined whether one is paying attention to global features or local features of an ambiguous/mixed stimuli. For eg, the most popular of these consists of a global big H made up of smaller (say 5 in number) F’s and then determining whether the subject notices the global H or the local F. Details can be seen in the Gable papers which are open access.

Now the authors found robust support for their hypothesis that it is the motivational direction and not affective valence that determines the attentional focus. They also relate it to adaptivity.

Positive affects, particularly those low in approach motivation, suggest a comfortable, stable environment and allow for a broadening of attention and cognition, which may serve adaptive functions (Carver, 2003; Fredrickson, 2001). However, broadening does not occur when positive affects are high in approach motivation. Such positive affects often encourage specific action tendencies, such as tenacious goal pursuit, and an associated reduction in attentional breadth. This reduced attentional breadth may prove adaptive, as it assists in obtaining goals.

They also extend these finding to negative affects and depression etc and I can easily relate them to earlier work I have covered regarding the danger or safety of environment and promotional/ preventive focus:

Together with past research, the present research supports the idea that low- and high-approach-motivated positive affect produce opposite effects on attentional breadth. It is possible that the intensity of withdrawal motivation exerts similar attentional effects; that is, low-withdrawal-motivated negative affect may cause broadening, whereas high-withdrawal-motivated negative affect may cause reduction in breadth. Indeed, such an interpretation would fit with past research. For example, individuals with depression, a low-intensity motivation, are more creative than nondepressed individuals (Andreasen, 1987) and show broadening of attention and memory (von Hecker & Meiser, 2005). In the case of low-motivated negative affects such as sadness and depression, “a more open, unfocused, unselective, low-effort mode of attention would prove not deficient but, on the contrary, beneficial” (von Hecker & Meiser, 2005, p. 456), as one disengages from a terminally blocked goal and becomes open to new possibilities (Klinger, 1975). The past research that found negative affect caused decreased attentional breadth may have evoked negative affective states that were high in withdrawal motivation (e.g., fear; Gasper & Clore, 2002).

This brings me to their current paper , aptly titled , The Blues Broaden, but the Nasty Narrows, that found exactly the effect hypothesized above that sadness/depressive mood was related to broadening of attention, while disgust, a negative emotion with high withdrawal motivation was related to narrowing of focus. they also found that the effect of negative emotion was mediated by arousal which could stand as a proxy for motivational direction.

These two experiments revealed that the relationship between negative affect and attentional precedence is more complex than commonly thought. In line with past theory and evidence, Experiment 2 demonstrated that negative affect caused a narrowing of attention. However, this narrowing occurred only when negative affect was high in motivational intensity. When negative affect was low in motivational intensity, in Experiment 1, it caused a broadening of attention. These results are consistent with the idea that the effect of emotion on local/global precedence is not due to negative versus positive affect, but is instead due to motivational intensity. Positive and negative affects of low motivational intensity broaden attention, whereas positive and negative affects of high motivational intensity narrow attention.

To me this is sufficient, clinching and converging proof of the theories I have been trying to develop with regards to emotions (specifically mania, depression, happiness and despair) and make clear that there are at least two dimensions to happiness/sadness and mental well being/illness constructs. Perhaps if we start liking what we have and stop coveting or wanting more, we have a philosophical, religious, as well as now a psychological, blueprint for how to lead the good life and how to avoid a living hell.

Gable, P., & Harmon-Jones, E. (2010). The Blues Broaden, but the Nasty Narrows: Attentional Consequences of Negative Affects Low and High in Motivational Intensity Psychological Science, 21 (2), 211-215 DOI: 10.1177/0956797609359622
Gable, P., & Harmon-Jones, E. (2008). Approach-Motivated Positive Affect Reduces Breadth of Attention Psychological Science, 19 (5), 476-482 DOI: 10.1111/j.1467-9280.2008.02112.x

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Happiness opposed to despair/ennui; sadness to anger/irritability

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We normally view happiness and sadness to be opposites on a single continuum, but I propose that it is time to change the textbooks and view happiness as opposed to ennui/despair and sadness as opposed to anger/irritability when it comes to basic opponent affects.

But before we go down that path first a detour.

I recently read Flourishing: edited by Keyes & Haidt , and the last article by Keyes caught my attention. I looked up a few more articles by Keyes and found this one that again elaborates on the theory put forward in the book chapter.

The point Keyes wants to make is that mental illness and mental health are two different things and are relatively independent of each other. Traditionally mental health has been conceptualized as the absence of mental illness, but Keyes says that our intuitions are incorrect here and mental health is another, parallel continuum on which people can differ.

Throughout human history, there have been three conceptions of health.The pathogenic approach is the first, most historically dominant vision, derived from the Greek word pathos, meaning suffering or an emotion evoking sympathy. The pathogenic approach views health as the absence of disability, disease, and premature death. The second approach is the salutogenic approach, which can be found in early Greek writings and was popularized by Antonovsky (1979) and humanistic scholarship (e.g., Carl Rogers and Abraham Maslow). Derived from the word salus, meaning health, the salutogenic approach views health as the presence of positive states of human capacities and functioning in thinking, feeling, and behavior (Stru¨mpfer, 1995). The third approach is the complete state model, which derives from the ancient word for health as being hale, meaning whole and strong. This approach is exemplified in the World Health Organization’s (1948) definition of overall health as a complete state, consisting of the presence of a positive state of human capacities and functioning as well as the absence of disease or infirmity. By subsuming the pathogenic and salutogenic paradigms, the whole states approach is, in my opinion, the only paradigm that can achieve true population health.

Thus when we talk of whole states mental health we are basically talking about two related things- a mental illness or disability dimension and a flourishing or mental health dimension. Keyes et al have performed confirmatory factor analysis on measure used to measure mental health and illness and found that the data is best explained by two latent factors-one related to flourishing and the other to illness.

This is how they define mental health or flourishing dimension.

Until recently, mental health remained undefined, unmeasured, and therefore unrecognized at the level of governments and nongovernmental organizations. In 1999, the Surgeon General, then David Satcher, conceived of mental health as “a state of successful performance of mental function, resulting in productive activities, fulfilling relationships with people, and the ability to adapt to change and to cope with adversity” (U.S. Public Health Service, 1999, p. 4). In 2004, the World Health Organization published a historic first report on mental health promotion, conceptualizing mental health as not merely the absence of mental illness but the presence of “a state of well-being in which the individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively and fruitfully, and is able to make a contribution to his or her community” (World Health Organization, 2004, p. 12).

Keyes comes up with 13 symptoms of mental health and these include Positive emotions (i.e., emotional well-being) including positive affect and avowed quality of life; Positive psychological functioning (i.e., psychological well-being) consisting of self-acceptance, positive relations with others, personal growth, purpose in life, environmental mastery, and autonomy (see Keyes & Ryff, 1999); and Positive social functioning (i.e., social well-being) consisting of social coherence, social actualization, social integration, social acceptance, and social contribution. In DSM style they propose that individuals exhibit some minimum symptoms to classify as flourishing and those with very low scores be classified as languishing.

To be diagnosed as flourishing in life, individuals must exhibit high levels on at least one measure of hedonic well-being and high levels on at least six measures of positive functioning. Individuals who exhibit low levels on at least one measure of hedonic well-being and low levels on at least six measures of positive functioning are diagnosed as languishing in life. Adults who are moderately mentally healthy do not fit the criteria for either flourishing or languishing in life.

Keyes then goes on to show the costs of languishing and not focusing on mental health and why a narrow focus on cure/prevention of mental illness is detrimental, but that is beside the point as to today’s topic. what is most important take way for today is that there are two separate factors of mental health and mental illness.

This brings us back to the affects- happiness, sadness, ennui/despair and anger/irritability. Consider for a moment depression. It is an illness characterized by sad mood and anhedonia etc. Consider its counterpart on the illness spectrum. while a normal person not having depression may seem the counterpart, the real counterpart is mania which often has a angry/irritable mood (alongside euphoria) associated with it. Also depression is characterized as a reaction to losses/continuous exposure to stresses that makes goals out of reach/unachievable. Here the focus is preventive in nature- the state does not deteriorate further and goals do not remain unmet. However, depression or sad mood is also an avoidance reaction. One becomes withdrawn from the situation and does not fight the stress, but flights from the stress by withdrawing in a cocoon. The loss of appetite and more sleep can be seen as behavioral counterparts of withdrawing or exhibiting a flight response to stress.

As opposed to this, mania can be seen behaviorally as an active approach state in which one works actively towards the things required to overcome the loss of valued entity/life goal. Again, I propose that mania is a reaction to a situation similar to depression – when something is lost/ is under threat of losing- but this time , under stress, one fights and not flights- thus one becomes energized to right the wrong and may become angry/ irritable if the efforts to retain goals/ valued entities are frustrated by external world. It is important that both mania and depression are on the illness scale of functioning/ mental health and are a result of life trauma/ stress/ perceived/ real/ threat of loss of loved object/person. Thus the focus is preventive and the state is of scarcity.

Contrast this to a state of abundance when ones (life) goals have been met/ are within reach.// This apparent positive state of affairs may again give rise to different emotions/ behavioral manifestations depending on whether one has approach or avoidance dominant reaction. If one approaches the more free time available after goal accomplishment as a boon that can be used to home ones hobbies/find other meaning in life/ build relationships etc and not as a threat ( free time can be a threat) then one experiences positive emotion of happiness and behaviorally flourishes.

In contrast consider a similar person who has achieved everything in life – (a good job, wife, kids etc ) , but given the fact that one is living in abundance is frightened or flights from the free time that has been made available. that person will be listless, will exhibit ennui or boredom and may even exhibit despair as he finds life meaningless. Thus behaviorally he would languish.

Thus, I rest my case that happiness is opposed to ennui/despair while sadness is opposed to anger/irritability and while happiness is a measure of flourishing; sadness is a measure of illness. One can definitely conduct experiments , perform factor analysis to confirm, that indeed happiness and sadness is not a unitary construct, but are two separate but related dimensions. I would love to hear your comments.

Keyes, C. (2007). Promoting and protecting mental health as flourishing: A complementary strategy for improving national mental health. American Psychologist, 62 (2), 95-108 DOI: 10.1037/0003-066X.62.2.95

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Am happy, will be selfish; Am sad, will be fair. Oh Really?!?

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Many a times, researchers have their own personal agendas and its very human to fall in to the temptation to interpret study results or spin them to suit ones long term subject matter and expertise.  This is a trap in which Joe Forgas et al fall when they report in JESP that happy people are selfish and sad people are fair. They have a long research interest that goes aka sadness is beneficial for you and every result has to fit in that model.

In this latest study they use the behavior in the dictator game as a proxy for selfish behavior. the classical dictator game consist of giving a  sum of money to a person and asking them to divide it between themselves and another human being any way they deem fit. If an agent is rational , he should be purely selfish (there are assumed to be no future/past interactions and no reputations to maintain/ cultivate) . As is the normal finding, humans normally give upto 50 % of their share to another person in the dictator game although there are no obligations. As such , dictator game is indeed a good measure of internal selfishness of a person.

What Joe et al do is to induce good(happy)/bad(sad) mood  in their subjects and then ask them to play a version of the dictator game.  So far so good. However in their version of the dictator game , one is not given a sum of money to divide amongst oneself and someone else; but they are given 10 raffle tickets- each raffle ticket increasing the odds of winning a lottery of 20 $. Now ,here is where I think they have blundered an confounded the results. they have introduced odds and probability thinking in the scene and everyone knows that a normal person prefers a sure sum of money (10 $) over a chance of winning equivalent sum  (50 % chance of 0$ and 50  % chance of 20 $). Both utilities are mathematically equivalent but we are all normally risk-averse and prefer the assured sum. However, and this a big however, happy people are more risk prone and may prefer a chance much more than an assured sum. In sad mood things would be reverse.

Its not as if Joe et al are not aware of the happiness-risk proneness link, but they somehow ignore it and let it confound the results. To quote form the paper:

Happy mood may also function as a motivational resource (Trope, Ferguson, & Raghunanthan, 2001), allowing happy individuals to accept greater risks. These findings suggest that happy mood should promote a more confident, selfish allocation strategy, while negative mood should trigger more cautious, fair allocation.

Readers will immediately see where I am coming from. I am a huge fan of seeing happiness/ sadness in terms of environmental risk and safety and as motivational focus- promotion versus prevention focus. It is thus pretty obvious to me that a (or say 10) raffle ticket (a chance of winning 20 $) does not have the same value for a sad person a sit has for a happy person who is more in a risk -prone frame of mind. thus, it seems obvious that a happy person will adhere more utility to the raffle tickets and may not that readily part with them; while a person in a sad mood may think that chancy bit of paper as worthless and be more willing to share it with others. I challenge Joe et al to repeat the experiment with real money and not waffle tickets and then draw any conclusions.

Whats more in the first experiment (described above) the selfish tag on happy people was due to the fact that they did not share that much with out-groups. If out-groups (strangers ) were not present perhaps the results would not have been significant based on ingroup data alone. If, somehow, being sad broadens your vistas and makes you treat outgroups (strangers) the same as ingroups, then this would again confound the result and invalidate the conclusions reached by the authors. Of course this thesis that being sad ,makes you more open to strangers flies in face of the study I covered yesterday that sad people prefer familiarity;  but it is something to think about and design experiments to rule out.

Experiment 2 suffers from the same methodical flows. Experiment 3 tried to prove that when social expectations about being fair were relaxed, then happy people gave free rein to their selfishness and became selfish, while sad people remained fair and followed external norms of fairness. This is purportedly to relate it to the internal focus of selfish people and external focus of sad people and fit in a larger framework, but again it fails to convince me. At the outset let me clarify that I do adhere to happy people have internal focus while sad people are more driven by external norms. However the experiment they did supports my thesis sand not theirs.

In experiment 3, they manipulated the perceived social norm of fairness by revealing to subjects the behaviour of some hypothetical earlier participants in the dictator game. some were in the ‘fairness is the norm’ condition (more fair splits be earlier hypothetical participants), others were in the ‘fairness is not the norm’ condition- I like to call this ‘unfairness is the norm’ condition.

Now there are two caveats to this. First not everyone decides whether to act fairly or not based on existing norms. As per Kohlebrg’s or other modern developmental theories one sense of morality in an earlier stage may be driven by norms , but at later stages is determined by internal values and internalized norms. thus it is wrong to apriori believe that if people don’t act selfish it is because of pressure of the social norm of fairness. This is the position that study authors take and this is not necessarily true. Second, even if one grants that one works under social norms, it is false to believe that the social norm is fairness;  with the myriad misinterpretations of darwins theory selfishness has become the de facto social norm. Thus, one can as legitimately claim that selfishness is the existing norm that goes undermined by manipulations of experiment 3 and when primed with fair prior dictator behavior, gives free rein to mood effects to take place; while in the second condition where selfishness norm is reaffirmed there are no mood effects.

This hair splitting is important because in the third experiment they did not find a main effect of mood/ prior fairness norm  on dictator offerings, rather there was an interaction between the mood and prior priming. They found that when prior exposed to social norm of fairness there was no difference in happy and sad condition; the difference was there only in ‘selfishness is norm’ condition. One can thus, also interpret these findings as ‘selfishness is norm’ – in that selfishness norm when chances are involved happy people make more risky choices than sad people; however when the norm of selfishness is undermined, internal values like being fair (yes there is considerable literature that being fair is more natural and internally driven than being selfish)  takes hold and make seven happy people who value the raffle tickets a lot to become more fair and altruistic and share their tickets to the same extent as sad people do normally.

Its not as if they haven’t considered the dilemma of why the norm and undermining of it should be one way only. To quote:

Why did sad people not simply follow the norm – fairness or selfishness – and happy people follow their own internal state (i.e., ignore the norm and act selfishly) in this study? It is likely that information provided about the selfish behavior of others, being socially undesirable, could not invoke an acceptable, alternative shared social norm, and so served merely to undermine the powerful norm of fairness, allowing full scope for mood effects to occur. In contrast, information about the socially desirable, fair behavior by others served to reinforce a powerful existing social norm and so constrained mood effects, as found here.

So in summation, I am not convinced, I still believe the results they got are due to the happiness as increasing risk proneness effct. But I agree broadly with their thesis that sadness also has adaptive value and happiness should not be seen as all rosy and sadness all bad. The bad effect of extremes of euphoria/ mania are well known, to complement lets hear what they have to say of the good effect of sadness. I’ll like to end with their own quotes on this matter.

Interestingly, our results further challenge the common assumption in much of applied, organisational, clinical and health psychology that positive affect has universally desirable social consequences. Together with other recent experimental studies, our findings confirm that negative affect often produces adaptive and more socially sensitive outcomes. For example, negative moods can improve the detection of deception (Forgas & East, 2008), reduce judgmental errors (Forgas, 1998), improve eyewitness accuracy (Forgas, Vargas, & Laham, 2005), and improve interpersonal communication strategies (Forgas, 2007). The present experiments confirm this pattern by demonstrating that mild negative moods also increase fairness and sensitivity to the needs of others.

Tan, H., & Forgas, J. (2010). When happiness makes us selfish, but sadness makes us fair: Affective influences on interpersonal strategies in the dictator game Journal of Experimental Social Psychology DOI: 10.1016/j.jesp.2010.01.007

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