Accession Number : ADA263871

Title :   A Brain-Evoked Potential Study of Task Difficulty Using Verbal Memory and Mental Rotation Tasks,

Descriptive Note : Interim rept. 1 Oct 87-30 Sep 91.

Corporate Author : ARMSTRONG LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Palmer, Barbara ; Nasman, Victoria T. ; Wilson, Glenn F. ; Gundel, Alex

Report Date : JUN 1992

Pagination or Media Count : 29

Abstract : Different task processing requirements may produce different patterns of brain evoked potential (EP) variation with changes in task difficulty. We examined and compared EP changes associated with variable task difficulty in two dissimilar tasks: (1) the auditory Sternberg memory task, and (2) a visuo-spatial mental rotation task. EPs were submitted to source derivation and evaluated for changes related to increased central processing difficulty. Mid-latency EP amplitudes were differentially sensitive to changes in memory search (Sternberg) or perceptual complexity (mental rotation). The amplitude of a later endogenous component varied with task difficulty in both tasks, but demonstrated unique topographic distributions as well as unique pattern changes. These findings support the view that task difficulty effects on EPs are observable as changes to both mid-and long-latency components, but that these changes may differ with the processing requirements of different tasks.... Evoked potentials, Task difficulty, Electrical brain topography, Workload.

Descriptors :   *MEMORY(PSYCHOLOGY), *MENTAL ABILITY, AMPLITUDE, BRAIN, DISTRIBUTION, PATTERNS, PROCESSING, REQUIREMENTS, ROTATION, TOPOGRAPHY, VARIABLES, VARIATIONS, WORKLOAD.

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE