Infantile amnesia: A neurogenic hypothesis

In the late 19th Century, Sigmund Freud described the phenomenon in which people are unable to recall events from early childhood as infantile amnesia. Although universally observed, infantile amnesia is a paradox; adults have surprisingly few memories of early childhood despite the seemingly exuberant learning capacity of young children. How can these findings be reconciled? The mechanisms underlying this form of amnesia are the subject of much debate. Psychological/cognitive theories assert that the ability to maintain detailed, declarative-like memories in the long term correlates with the development of language, theory of mind, and/or sense of "self." However, the finding that experimental animals also show infantile amnesia suggests that this phenomenon cannot be explained fully in purely human terms. Biological explanations of infantile amnesia suggest that protracted postnatal development of key brain regions important for memory interferes with stable long-term memory storage, yet they do not clearly specify which particular aspects of brain maturation are causally related to infantile amnesia. Here, we propose a hypothesis of infantile amnesia that focuses on one specific aspect of postnatal brain development-the continued addition of new neurons to the hippocampus. Infants (humans, nonhuman primates, and rodents) exhibit high levels of hippocampal neurogenesis and an inability to form lasting memories. Interestingly, the decline of postnatal neurogenesis levels corresponds to the emergence of the ability to form stable long-term memory. We propose that high neurogenesis levels negatively regulate the ability to form enduring memories, most likely by replacing synaptic connections in preexisting hippocampal memory circuits.     

Academic careers in Asia: A cross-cultural analysis

Using Berry’s (1980) acculturation model as our theoretical foundation, we provide a conceptual framework for the cross-cultural analysis of academic careers in Asia in contrast to the United States. Consistent with Berry’s model, we propose a classification of three approaches to research (Adopted Western, Asian, and Integrationist) that can be selected by Asian academics. An individual’s acculturation level or cultural identity is then proposed as the key factor in influencing his or her decision of which research approach is selected. Next, we examine the cultural contextual factors in the academic environment in Asia that interacts with the three approaches to research and conclude that the Integrationist approach, while quite challenging, is likely to be the most productive in the long run. Finally, we discuss some unanswered questions raised by our analysis.     

Youth suicide: a cross-cultural perspective

Changes in the suicide rate of teenagers and young adults internationally from 1970 to 1980 were examined. Twenty-three nations experienced an increase (with Norway experiencing the largest percentage increase), while six experienced a decrease. Unlike general suicide rates, teenage suicide rates were not related to the quality of life in the nations surveyed.     

Self-concept: a cross-cultural study.

Self-concept differences between 190 American and 98 Danish 5th and 6th grade suburban students were examined in light of known societal and educational differences. Danish males and American females reported significantly higher self-confidence in personal attributes; American students reported higher achieving in school scores than Danish students. Results are discussed in the contex of cultural differences; further areas of investigation are offered.     

Achievement and morality: a cross-cultural analysis of causal attribution and evaluation.

A recent study by Weiner and Peter has considered the emergence of certain patterns of attribution and evaluation in achievement and moral situations. According to their analysis, judgments should generally follow a Piagetian sequence in which younger children are influenced more by the outcome of an episode and older children by the intent of the protagonist. With a sample of U.S. subjects they found overall support for this analysis. A major of the present study is to determine how sociocultural factors may influence the judgmental patterns outlined by Weiner and Peter by essentially replicating their study in the manifestly different cultural context provided in Iran. Important discrepancies with Weiner and Peter were found which can be attributed to sociocultural factors. However, the cognitive-developmental framework proved generally valuable in working toward a comparative understanding of socialization patterns extant in the two cultures.     

A cross-cultural investigation of college student alcohol consumption: a classification tree analysis

In this cross-cultural study, the authors attempted to identify high-risk subgroups for alcohol consumption among college students. American and Greek students (N = 132) answered questions about alcohol consumption, religious beliefs, attitudes toward drinking, advertisement influences, parental monitoring, and drinking consequences. Heavy drinkers in the American group were younger and less religious than were infrequent drinkers. In the Greek group, heavy drinkers tended to deny the negative results of drinking alcohol and use a permissive attitude to justify it, whereas infrequent drinkers were more likely to be monitored by their parents. These results suggest that parental monitoring and an emphasis on informing students about the negative effects of alcohol on their health and social and academic lives may be effective methods of reducing alcohol consumption. Classification tree analysis revealed that student attitudes toward drinking were important in the classification of American and Greek drinkers, indicating that this is a powerful predictor of alcohol consumption regardless of ethnic background.     

Persistent autobiographical amnesia: a case report

We describe a 47-year-old man who referred to the Emergency Department for sudden global amnesia and left mild motor impairment in the setting of increased arterial blood pressure. The acute episode resolved within 24 hours. Despite general recovery and the apparent transitory nature of the event, a persistent selective impairment in recollecting events from some specific topics of his personal life became apparent. Complete neuropsychological tests one week after the acute onset and 2 months later demonstrated a clear retrograde memory deficit contrasting with the preservation of anterograde memory and learning abilities. One year later, the autobiographical memory deficit was unmodified, except for what had been re-learnt. Brain MRI was normal while H20 brain PET scans demonstrated hypometabolism in the right globus pallidus and putamen after 2 weeks from onset, which was no longer present one year later. The absence of a clear pathomechanism underlying focal amnesia lead us to consider this case as an example of functional retrograde amnesia.     

Psychopathy in Iran: a cross-cultural study

Few cross-cultural studies have assessed psychopathy and none have included a sample from non-western countries. This study investigated the factor structure of the Psychopathy Checklist: Screening Version (PCL:SV) in an Iranian sample, and compared the results with a western sample. Three hundred fifty-one Iranian prisoners were compared with 405 participants of the standardization sample of the PCL:SV. Confirmatory factor analysis and item response theory method were used for data analysis. The Iranian data fitted well with the hierarchical three-factor model of psychopathy and neither two- nor four-factor models showed an adequate fit. Differential item functioning existed across samples, with discriminatory power of factor 1 (arrogant and deceitful interpersonal style) being lower in the Iranian sample that for factor 2 (deficient emotional experience) being greater in the Iranian sample than the standardization sample. Deficient emotional experience might be the most significant factor in diagnosing psychopathy, regardless of the studied culture. Other factors appear to be relatively culture-specific.     

Current scientific interest in dissociative amnesia: A bibliometric analysis

In a bibliometric analysis, we used the PubMed search engine to count the number of publications identified by the search term “dissociative amnesia” for the years 2011–2020. We then counted publications from the same decade for five representative comparison disorders: “panic disorder,” “anorexia nervosa,” “obsessive–compulsive disorder,” “attention deficit hyperactivity disorder,” and “bipolar disorder.” Our search yielded only 89 publications for “dissociative amnesia,” and only seven of these involved localized or selective amnesia for specific events. By contrast, we found between 3000 and 21,000 publications for each of the five comparison disorders during 2011–2020. We performed several additional secondary analyses, all of which suggested that the diagnosis of “localized or selective dissociative amnesia” has generated little scientific interest in recent years. Examining possible hypotheses to explain this lack of interest, it appears most likely that the concept of localized or selective dissociative amnesia is not widely accepted among scientists at present.     

Authoritarianism,directiveness and self-esteem revisited: A cross-cultural analysis

This paper reports a series of studies in which the association between authoritarianism and directiveness on the one hand, and self-esteem on the other, are reported. Overall, the findings suggest that, contrary to previous research (e.g. Larsen and Schwendiman, 1969), there is no significant correlation between self-esteem and authoritarianism as traditionally conceived by Adorno et al. (1950). Moreover, self-esteem is positively associated with directiveness (that is, dominance). Finally, results using a new behavioural measure of authoritarianism suggest that authoritarians may have positive self-esteem. This latter finding awaits replication.     

Childhood amnesia: a conceptualization in cognitive-psychological terms

Childhood amnesia is defined operationally as the forgetting of early life events to a significantly greater degree than is accounted for by "normal" forgetting, which is an increasing recall decrement as time since occurrence increases. Three cognitive processes and their developmental changes are discussed which, when considered with psychodynamic factors, may broaden the understanding of childhood amnesia. It is argued that psychoanalytic theory and technique can benefit from the research and methods of cognitive psychology.