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Attention Allocation under Thermal Stress

A visual-visual dual task was designed to test the effect of the thermal environment on dual task performance. The temperatures selected for testing were 77, 86 and 95 °F Wet Bulb Globe Temperature (WBGT). Forty-two volunteers were randomly assigned to one of the three temperature conditions. During the hour session, the emphasis was switched every 12 minutes between the two tasks (i.e., 100/0, 75/25, 50/50, 25/75, 0/100). POC analysis could then be conducted using data from these 5 emphasis conditions. Individual differences in single task performance were controlled by equating the baselines of single task performance. Once individual differences in single task capacity were controlled, statistically significant differences were demonstrated in terms of functional performance region (FPR) and in divided attention cost.