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A Principal Components Analysis of Executive Processes: Exploring the Structure of Executive Functions using Neuropsychological Tests

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Maner 2011 MSc.pdf (312.3Kb)
Date
23/11/2011
Item status
Restricted Access
Author
Maner, Safir
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Abstract
Whether executive system is a unified or separable structure is still a matter of debate. Using an individual differences approach, this study investigated the structure of five hypothesized executive functions (“Updating”, “Shifting,” “Inhibition”, “Dual-Tasking” and “Planning”) and their relationship to “Intelligence”. The separability of these executive functions was explored. Ten neuropsychological tests were administered to young and healthy participants (N =103). Correlations between tests that were expected to tap the same EF were low. Results of the Principal Components Analysis revealed nine components only 4 of which were clear enough to interpret in relation to previous literature. Overall results suggest some degree of separability of “Updating”, “Shifting” and “Dual-Tasking”, in addition to independence of all nine components from “Intelligence”. However there is some room for concern with regards to the overall reliability of these results (α = .487) and sample adequacy (KMO = .475).
URI
http://hdl.handle.net/1842/6064
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