Dual Task Performance in Normal Aging: A Comparison of Choice Reaction Time TasksReportar como inadecuado




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This study examined dual task performance in 28 younger 18–30 years and 28 older >60 years adults using two sets of choice reaction time RT tasks paired with digit tasks. Set one paired simple choice RT with digit forward; set two paired complex choice RT with digit backward. Each task within each set had easy and hard conditions. For the simple choice RT, participants viewed single letters and pressed a specified keyboard key if the letter was X or Z or a different key for other letters easy. For the hard condition, there were 4 target letters X, Z, O, Y. Digit forward consisted of 4 easy or 5 hard digits. For the complex choice RT, participants viewed 4×4 matrices of Xs and Os, and indicated whether four Xs easy or four Xs or four Os hard appeared in a row. Digit backward consisted of 3 easy or 4 hard digits. Within each set, participants performed every possible combination of tasks. We found that in the simple choice RT tasks older adults were significantly slower than, but as accurate as younger adults. In the complex choice RT tasks, older adults were significantly less accurate, but as fast as younger adults. For both age groups and both dual task sets, RT decreased and error rates increased with greater task difficulty. Older adults had greater dual task costs for error rates in the simple choice RT, whereas in the complex choice RT, it was the younger group that had greater dual task costs. Findings suggest that younger and older adults may adopt differential behavioral strategies depending on complexity and difficulty of dual tasks.



Autor: Eleftheria Vaportzis, Nellie Georgiou-Karistianis, Julie C. Stout

Fuente: http://plos.srce.hr/



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