Accession Number : ADP006095

Title :   Event-Related and Steady Potential Changes in the Brain Related to Workload during Tracking,

Corporate Author : BURDEN NEUROLOGICAL INST BRISTOL (UNITED KINGDOM)

Personal Author(s) : McCallum, W. C. ; Cooper, R. ; Pocock, P. V.

Report Date : FEB 1988

Pagination or Media Count : 10

Abstract : In two experiments ERP's and slow potential changes have been recorded from normal subjects performing a visual tracking task in which the level of difficulty was systematically varied. In the second experiment a secondary discrimination task was added to increase the level of operator load and to probe the allocation of cerebral processing resources. The most notable feature to emerge was a protracted slow potential shift, associated with the primary task. The amplitude of this shift proved to be sensitive to the difficulty manipulations such that increased difficulty resulted in increased negativity. However, a memory task introduced in the early part of each trial tended progressively to decrease the amplitude of the shift as the memory demand increased. ERP's to the individual points of decision and response during the course of a trial were also found to be sensitive to the level of task loading. The introduction of the secondary task resulted in a possible further increase in the negative shift to tracking, but in reductions in the amplitude of late cognitive components of the secondary task ERP's compared with their levels when this task was presented on its own. (js)

Descriptors :   *COGNITION, AMPLITUDE, BRAIN, CEREBRUM, DISCRIMINATION, MEMORY DEVICES, MEMORY(PSYCHOLOGY), OPERATORS(PERSONNEL), PROCESSING, RESOURCES, SECONDARY, SENSITIVITY, SHIFTING, STEADY STATE, TRACKING, VISION, VISUAL SURVEILLANCE, WORKLOAD.

Subject Categories : Psychology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE