A Critique of Howard's Argument for Innate Limits in Chess Performance or Why We Need an Account Based On Acquired Skill and Deliberate Practice

In this issue Howard reported that the effect of chess study is surprisingly small among elite chess players, who continue playing more games in international chess tournaments. In contrast, we show that individual differences in chess study are the likely causes of both higher chess ratings and more chess games played in international tournaments, which is often very costly and includes airfare, hotel, and tournament registration fees. The low correlation between his estimates of study time and chess rating is shown to be a consequence of his methodology of relying on a couple of questions in an internet survey rather than the standard methodology in expert performance research involving a 30‐minute interview tracing yearly engagement in many different practice activities. Copyright © 2012 John Wiley & Sons, Ltd.     

Evaluation context's role in driving positive word‐of‐mouth intentions

Relevant literature recognizes that transaction‐specific and cumulative evaluations are different, but few empirical studies test how these differences might affect the link between product evaluations and word of mouth (WOM). This study addresses this issue by assessing the simultaneous effects of perceived quality and satisfaction on the resulting positive WOM intentions for both types of evaluations. Results reveal that different factors drive positive WOM intentions depending on the context of the study. When the consumers' evaluations are related to a specific transaction, perceived quality is the dominating predictor of positive WOM intentions. When the evaluations are cumulative, satisfaction is the dominating predictor of positive WOM intentions. Copyright © 2012 John Wiley & Sons, Ltd.     

Evidence for rule-based processes in the inverse base-rate effect.

Three studies provide convergent evidence that the inverse base-rate effect (Medin & Edelson, 1988) is mediated by rule-based cognitive processes. Experiment 1 shows that, in contrast to adults, prior to the formal operational stage most children do not exhibit the inverse base-rate effect. Experiments 2 and 3 demonstrate that an adult sample is a mix of participants relying on associative processes who categorize according to the base-rate and participants relying on rule-based processes who exhibit a strong inverse base-rate effect. The distribution of the effect is bimodal, and removing participants independently classified as prone to rule-based processing effectively eliminates the inverse base-rate effect. The implications for current explanations of the inverse base-rate effect are discussed.     

Risk- and protective factors for memory plasticity in aging

ABSTRACT

Risk and protective factors for cognitive function in aging may affect how much individuals benefit from their environment or life experiences by preserving or improving cognitive abilities. We investigated the relations between such factors and outcome from episodic-memory training in 136 healthy young and older adults. Tested risk factors included carrying the ?4 variant of the apolipoprotein E allele (APOE), age, body mass index, blood pressure, and cholesterol. Protective factors included higher levels of education, intelligence quotient (IQ), physical activity, fatty acids, and vitamin D. Average increases in memory performance were seen after training, with ample variation between individuals. Being young, female, and having higher IQ were positive predictors of memory improvement. No other relationships were observed. Similar benefit was observed across APOE allelic variation. This indicates that beyond IQ, age, and sex, known risk -and protective factors of cognitive function in aging were not significantly related to memory plasticity.