The Effect of an Extrinsic Incentive on Psychophysiological Measures of Mental Effort and Motivational Disposition when Task Demand is Varied

Abstract

The operationalisation of user psychological state is essential for physiological computing systems. The present study investigated the sensitivity of different psychophysiological measures to task engagement in a cognitive challenge scenario. A repeated measures design manipulated working memory demand and financial incentive. Low, high and impossible levels of cognitive challenge were created by combining memory demands with required standards of performance. 20 participants completed two blocks of the task, once with a financial incentive and once without. Performance, EEG, blood pressure, ECG, respiration and pupillometry were measured during task completion along with subjective reports of motivation and effort. Results showed sensitivity to demand for all EEG measures, blood pressure and heart rate variability (0.1Hz component). Sensitivity to incentive was found for EEG lower alpha suppression, heart rate and blood pressure. No effects were found on pupillometry and respiration data. Implications for the development of a real time cognitive monitor are discussed.

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