Impaired Selective Attention Caused By Mental Fatigue
Journal Title: Journal of Neurological Sciences-Turkish - Year 2012, Vol 29, Issue 3
Abstract
Objective: Fatigue decreases efficiency in performing daily tasks, and this is a common symptom in modern society. It would thus be of great value to clarify the mechanism underlying fatigue and to develop efficient methods to evaluate fatigue. We examined cognitive function associated with two types of mental fatigue. Methods: Twenty healthy volunteers were randomised to perform rest or fatigue-inducing mental task session (0-back or 2-back test session) for 30 min in a 3-way crossover design. Just before and after each session, participants completed cognitive task trials to evaluate simple and conflict-controlling selective attention (response inhibition). Results: Changes in the reaction time of simple selective attention task after the 2-back test session were longer and changes after the 0-back test session had a trend toward being longer than those after the rest session. In addition, changes in the percent error for Stroop effect after the 2-back test session were significantly higher than those after the rest session, although those after the 0-back test session were not. Conclusions: Different types of mental fatigue produced different styles of deteriorated cognitive performances. Impaired selective attention may be a specific feature of mental fatigue, and a higher mental load may introduce a greater level of impaired conflict control or response inhibition.
Authors and Affiliations
Masaaki Tanaka, Akira Ishii, Yoshihito Shigihara, Seiki Tajima, Masami Funakura, Etsuko Kanai, Yasuyoshi Watanabe
Keywords
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