Hemispheric Laterality and Self-Rated Personality Traits

Killgore, William D. S.; DellaPietra, Lynn; Casasanto, Daniel

doi:10.2466/pms.1999.89.3.994

Cited by 3 publications

(3 citation statements)

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“…Although we detected stable individual differences in observed behaviour, this variation was not attributable to observed individual variation in hand use in marmosets. Contrary to our prediction, neither direction nor strength of hand preference in a food-reaching task were linked to personality, as found also in humans and other species [ 16 , 34 , 35 , 42 ]. For instance, Extraversion and Agreeableness were not associated with the direction of limb preference in donkeys [ 16 ], lateral bias did not correlate with docility in sharks [ 22 ], and most of the personality dimensions did not show a link with paw preference in dogs [ 34 ].…”

Section: Discussioncontrasting

confidence: 99%

“…There are several possible explanations for this result. First, perhaps brain lateralization is not the proximate mechanism responsible for maintaining personality variation in the common marmoset and other species, including humans [ 35 , 42 ]. One of the possible suggested explanations for personality differences between left-handers and right-handers in humans stems from a different experience of left-handers as a minority group in a right-handed majority society.…”

Section: Discussionmentioning

confidence: 99%

“…Studies on humans did not report any clear pattern, and the link between lateral bias and personality seems to be equivocal [ 40 ]. While some studies confirmed personality differences between left- and right-handed individuals along the approach-withdrawal hypothesis [ 40 , 41 ], others found a reversed relationship [ 38 , 40 ] or no evidence for the link with personality [ 35 , 42 ]. Thus, studies on non-human primates could contribute to understanding the evolutionary mechanisms underlying the complex relationship between lateral bias and personality.…”

Section: Introductionmentioning

confidence: 99%

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Age, but not hand preference, is related to personality traits in common marmosets (Callithrix jacchus)

et al. 2022

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The proximate mechanisms underlying animal personalities, i.e. consistent inter-individual differences in behaviour, are a matter of discussion. Brain lateralization, expressed as the preferred use of the contralateral limb, has been suggested as one of these mechanisms. In this study, we measured a proxy of brain lateralization in captive common marmosets ( N = 28) by testing hand preference in a simple food-reaching task and evaluated personality by coding a wide range of behaviours observed in daily situations. We explored the links between personality and both direction and strength of hand preference, as well as age and sex, using linear models. Principal component analysis revealed that the stable behavioural variables were organized in three personality dimensions: Agreeableness, Extraversion and Neuroticism. Regarding hand preference, 14 individuals were left-handed, seven were right-handed and seven were ambilateral. Contrary to our predictions, we did not find any relationship between personality scores and hand preference or sex. Instead, age was a significant predictor of personality scores, with older individuals being more agreeable and less extraverted. The link between brain lateralization and personality seems to be equivocal and dependent on personality and brain lateralization assessment methods. Further examinations of other proximate mechanisms, such as physiology or (epi)genetics, may elucidate what drives personality variation in common marmosets.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Age, but not hand preference, is related to personality traits in common marmosets (Callithrix jacchus)

et al. 2022

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Is a lack of cerebral hemisphere dominance a risk factor for social “conflictedness”?

Spere

Riniolo

2005

Personality and Individual Differences

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Hand preference predicts reactions to novel foods and predators in marmosets (Callithrix geoffroyi).

Braccini

Caine

2009

Journal of Comparative Psychology

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In chimpanzees (Pan troglodytes) and common marmosets (Callithrix jacchus), left-handed individuals are less likely than right-handed individuals to explore new objects and situations, suggesting a relationship between the hemispheric specialization of emotional states and motor function. To further explore this relationship and to test the hypothesis that fearfulness is related to hand preference, we assessed willingness to approach, sniff, and taste novel foods, and the duration of freeze reactions in response to hawk calls, in 18 Geoffroy's marmosets (Callithrix geoffroyi). In accordance with these hypotheses, left-handed marmosets were slower to explore novel foods and slower to emerge from a freeze response than right-handed marmosets. Hand preference and at least some features of temperament seem to be related in this and other species of primates.

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Hemispheric Laterality and Self-Rated Personality Traits

Abstract: Cerebral hemispheric lateralization and personality traits were evaluated in 154 undergraduate and nonclinical volunteers. Personality ratings did not differ significantly between groups defined on the basis of hand, eye, or ear preference.

Cited by 3 publications

References 10 publications

Age, but not hand preference, is related to personality traits in common marmosets (Callithrix jacchus)

Age, but not hand preference, is related to personality traits in common marmosets (Callithrix jacchus)

Is a lack of cerebral hemisphere dominance a risk factor for social “conflictedness”?

Hand preference predicts reactions to novel foods and predators in marmosets (Callithrix geoffroyi).

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