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Abstract

This study examined the use of transcranial Doppler ultrasonography (TCD) as a tool to measure mental effort (as indexed by cerebral blood flow velocity) with increases in task load. Two tasks were chosen for this study based on their applicability to the task of piloting, a working memory (digit span) task and a visuo-motor tracking task. Based on previous findings of a possible relationship between mental workload and cerebral blood flow velocity it was hypothesized that both tasks would exhibit an increase in cerebral blood flow velocity in relation to baseline and that blood flow velocity would increase with increases in task demand. Although performance and subjective measures of mental workload indicated increased levels of effort to perform the digit span and tracking tasks as a function of task load, no systematic change in blood flow velocity was found with task demand in either task. Future work is needed to validate the use of TCD as a workload measurement tool.

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The Effects of Task Load on Performance and Cerebral Blood Flow Velocity in a Working Memory and a Visuomotor Task

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