Procedural learning refers to the ability to learn new perceptual, motor or cognitive skills. While many studies have explored procedural learning abilities in patients with different types of brain damage, the cognitive mechanisms involved in the acquisition of a new skill are still not well understood. The present review focuses on the conditions that optimise skill acquisition, and more specifically on the contextual interference effect (CIE), which refers to the advantage of a 'random' over a 'blocked' practice condition in skill learning tasks. According to both the 'elaboration' and 'reconstruction' hypotheses, the CIE can be explained by the fact that the random schedule requires more cognitive activity than the blocked one. However, if the CIE has been consistently demonstrated in laboratory studies, it is not so clear in field-based studies. We discuss this 'laboratory and field dilemma', and suggest that two main factors -task complexity and individual variables -may explain the discrepancy between the two types of studies.
Thorell and Nyberg (2008 ) recently developed the Childhood Executive Functioning Inventory (CHEXI), a new rating instrument for executive functioning in day-to-day life which can be divided into four subscales: working memory, planning, inhibition, and regulation. Using an exploratory factor analysis on data from young Swedish children attending kindergarten, Thorell and Nyberg (2008 ) found a two-factor solution that taps working memory and inhibition. In the present study, we explored the psychometric characteristics of the French adaptation of the CHEXI. A group of 95 parents of 5- and 6-year-old children completed the CHEXI, 87 of whom were given clinical inhibition and working memory tasks. Confirmatory factor analyses confirmed the two-factor solution based on inhibition and working memory that was identified in the original study of Swedish children. Supplementary results indicated good internal and test-retest reliability for the entire scale, as well as for the two subscales identified. Correlation analyses showed no relationship between cognitive measures and the CHEXI subscales. Possible clinical applications for the CHEXI scales are discussed.
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