Rigidity and flexibility of gender stereotypes in childhood: developmental or differential?

Previous research has shown that the early learning of male–female categories is characterized by rigid beliefs about stereotypic differences, but that once gender knowledge is well established, the beliefs become more flexible. Because most studies are cross‐sectional, it is not known if the early rigidity represents a normative transitional developmental stage that passes, or if early individual differences in rigidity continue into later childhood. To answer that question, analyses were performed on longitudinal data of 64 children who had been questioned about their gender concepts yearly from ages 5 to 10 years. Supporting a cognitive‐developmental approach, the findings showed that the period of rigidity was short‐lived whether rigidity began early or late or whether the level of peak rigidity was high or low. Copyright © 2005 John Wiley & Sons, Ltd.     

Infants’ sense of approximate numerosity: Heritability and link to other concurrent traits

The ability to perceive approximate numerosity is present in many animal species, and emerges early in human infants. Later in life, it is moderately heritable and associated with mathematical abilities, but the etiology of the Approximate Number System (ANS) and its degree of independence from other cognitive abilities in infancy is unknown. Here, we assessed the phenotypic specificity as well as the influence of genetic and environmental factors on the ANS in a sample of 5-month-old twins (N = 514). We found a small-to-moderate but statistically significant effect of genetic factors on ANS acuity (heritability = 0.18, 95% CI: 0.02, 0.33), but only when differences in numerosity were relatively large (1:4 ratio). Non-verbal ability assessed with the Mullen Scales of Early Learning (MSEL) was found to be heritable (0.47; 95% CI: 0.34, 0.57) and the phenotypic association between ANS acuity and non-verbal ability performance was close to zero. Similarly, we found no association between ANS acuity and general attention during the task. An unexpected weak but statistically significant negative association between ANS acuity and scores on the receptive language scale of the MSEL was found. These results suggest that early ANS function may be largely independent from other aspects of non-verbal development. Further, variability in ANS in infancy seems to, to some extent, reflect genotypic differences in the population.

Highlights

• Assessing 514 infant twins with eye tracking, we found that infants' sense of approximate numerosity is heritable and not positively associated with concurrent attentional, cognitive or motor abilities.
• These results have implications for our understanding of development of mathematical ability and the link between cognitive abilities early in postnatal life.

     

Rorschach Assessment of Two Distinctive Personality States of a Person With Dissociative Identity Disorder

This case study used test data from a patient with Dissociative Identity Disorder (DID; American Psychiatric Association, 2013 American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Arlington, VA: American Psychiatric Association.[Crossref] , [Google Scholar]) to illustrate how two main personality states of the patient (“Ann” and “Ben”) seemed to function. The Rorschach Performance Assessment System (R–PAS; Meyer, Viglione, Mihura, Erard, &; Erdberg, 2011 Meyer, G. J., Viglione, D. J., Mihura, J., Erard, R. E., &; Erdberg, P. (2011). Rorschach Performance Assessment System: Administration, coding, interpretation, and technical manual. Toledo, OH: Rorschach Performance Assessment System. [Google Scholar]) and the Inventory of Interpersonal Problems–Circumplex (IIP–64; Horowitz, Alden, Wiggins, &; Pincus, 2000 Horowitz, L. M., Alden, L. E., Wiggins, J. S., &; Pincus, A. L. (2000). IIP–64/IIP–32 professional manual. San Antonio, TX: Psychological Corporation. [Google Scholar]), administered to Ann and Ben in separate settings, exposed two diverse R–PAS and IIP–64 profiles. Ann's R–PAS profile suggested an intellectualized style of information processing with few indications of psychological problems. Ben's profile indicated severe perceptual, cognitive, and interpersonal difficulties combined with suspicion and anxiety. Ann's IIP–64 profile suggested minor interpersonal problems, whereas Ben's indicated serious relational difficulties. The findings were discussed in relation to the theory of trauma-related structural dissociation of the personality (van der Hart, Nijenhuis, &; Steele, 2006 van der Hart, O., Nijenhuis, E. R. S., &; Steele, K. (2006). The haunted self: Chronic traumatization and structural dissociation of the personality. New York, NY: Norton. [Google Scholar]), which implies an enduring split in the organization of the personality with more or less separate entities with their own sense of self, perception of the world, and ways of organizing emotional, cognitive, and social functions. The DID personality structure is seen as a defense strategy and as a pathway in the personality development producing serious psychological pain and symptoms.