Regular readers of The Mouse Trap would be aware of my ABCD model of psychology whereby all psychological phenomena are explained in terms of Affective, Behavioral, Cognitive and Dynamic/Desire dimensions.

Personality Traits from

Personality Traits from (Photo credit: Wikipedia)

The affective dimensions is also related to sensory processes; the behavioral dimension to motor processes; the cognitive dimension to associative processes and the desire/dynamic/motives dimension to social processes.

We are increasingly focusing on brain as a means to study psychological phenomena and thus four major divisions of neurosciences are affective neurosciences, behavioral neurosciences, social neurosciences and cognitive neurosciences.

Now, I have written extensively about personality, especially in relation to emotions, and have written a series of posts about the structure of personality traits and the underlying basic emotions. I have also tangentially touched upon or used ABCD and the fundamental four model while coming up with those previous posts; but today’s post is exclusively focused on the ABCD model and its utility for delineating personality traits.

Before we move onto personality traits, lets refresh our knowledge of brain structure. As per a controversial theory of brain structure, by Paul McLean, brain can be divided into a reptilian brain,a paleomammalian brain/ limbic brain and a neomammilain brain/neocortex; for our purpose the details of the model need not be true. However, one thing that McLean postulated was that older brain regions are in control of newer regions and if newer brain regions malfunction/ do not exercise control the behavior due to older system may get activated. Hughlings Jackson had surmised the same earlier and this is the part I will be focusing on.

Consider an earlier brain part that controls movement; (this may be mostly instinctual responding or impulsive initiation) ; a later brain part may inhibit and lead to better response/ proactive action that is well considered/ planned. I will call these two instances bottom-up effects and top-down effects on movement respectively.

With this in mind lets start a deeper look at the ABCD.

  1. Affective/sensory: This would be related to detecting unexpected stimuli or looking out for expected stimuli.
    1. The bottom up process of detecting incoming stimuli is enhanced by level of arousal. High arousal leads to better detection and low arousal to lesser detection; people may differ in their natural arousal levels and I guess you know where I am going with this-the introversion- eXtraversion dimension.
    2. The top down process of looking out for (potentially harmful) stimuli may lead to worry or anxiety. High Anxiety may help in vigilant detection, while lower anxiety to lapses in detecting harmful stimuli; the natural variation in this may be the trait Emotionally stable-Neuroticism( Emotionality). Anxiety remember was one of the dimensions discovered by Gray as relevant to personality.
  2. Behavioral/Motor:   This would be related to initiating action or responding to stimuli.
    1. The bottom up process here would lead to Impulsivity , another dimension elaborated on by Gray. The personality trait relevant here would be Impulsive Sensation Seeking as defined by Zuckerman.
    2. The top down process here would lead to Inhibition; when that process does not work, the low pole would be disinhibition (which is distinct from impulsivity). In FFM/HEXACO , this trait may be labeled as Conscientiousness and is related to strength of self-regulation.
  3. Drives/Social:  This would be related to interactions with others and the motives behind them – either to help others or the reciprocate a previous help.
    1. The bottom up process here is reactive reciprocation; or aggression in case of deception/defection by the other. The one end of this pole will be characterized by Aggression and hostility while the other pole by nice and reciprocal behavior and this leads us right on to Agreeableness dimension.
    2. The top down or expectation driven process here would be trusting and helping others on the one pole (in hope of reciprocation) and manipulating, hurting or exploiting people on the other. this naturally leads us to Honesty-humility dimension of HEXACO and the opposite pole that I believe is the dark tetrad of sadism, Machiavellianism, narcissism and sadism.
  4. Cognitive/ associative : This would be related to the tendency to make and use broad vis–vis narrow associations while doing information processing.
    1. The bottom up process here could be related to distractibility vis-a-vis focus. Some people may be easily distracted/ form loose associations and this may lead to Openness to experience in them; others may be more closed to new information. I think of this as the encoding process.
    2. The top down process here could be related to imagining novel associations between concepts etc. I would say this is a new dimension called Imagination dimension (Scott Barry Kaufman would be happy to hear:-)) .  At one end would be daydreamers and creative folks , at the other end more pragmatic/ reality oriented folks. I relate this to retrieval process. As this trait may still be evolving, we see psychosis related to this- imaginations/ top down processes overpowering reality orientation. this may also explain the association of creativity and mental illness.


I am happy with this personality structure organization with eight traits, instead of the usual five, that I have come up with. It has a solid theoretical rationale and a lot of thinking has gone into it; of course empirical work will prove whether its true or not and whether it stands the test of time!!

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