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.
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References
1.
AzerN.Z.McNallP.E.LeungH.C. (1972). Effects of heat stress on performance. Ergonomics15 (6): 681–691.
2.
BellC.R.ProvinsK.A.HiornsR.W. (1964). Visual and auditory vigilance during exposure to hot and humid conditions. Ergonomics, 7, 279–288.
3.
BellP.A. (1978). Effects of noise and heat on primary and subsidiary task performance. Human Factors, 20, 749–752.
4.
BellP.A.GreeneT.C. (1982). Thermal stress: physiological, comfort, performance, and social effects of hot and cold environments. In EvansG.W., Environmental Stress. University Press: Cambridge. pp.75–104.
5.
BursillA.E. (1958). The restriction of peripheral vision during exposure to hot and humid conditions. Quarterly Journal of Experimental Psychology, 5, 113–129.
6.
GretherW.F. (1973). Human performance at elevated environmental temperatures. Aerospace Medicine, 44, 747–755.
7.
GriffithsI.D. (1975). The thermal environment. In CanterD.C., Environmental interaction: Psychological approaches to our physical surroundings. New York: International Universities Press.
8.
HancockP.A. (1984). Environmental stressors. In WarmJ.S., Sustained Attention in Human Performance. New York: Wiley.
9.
HancockP.A. (1989). A Dynamic Model of Stress and Sustained Attention. Human Factors, 31(5), 519–537.
10.
HancockP.A.VasmatzidisJ. (1998). Human occupational and performance limits under stress: the thermal environment as a prototypical example. Ergonomics, 41(8), 1169–1191.
11.
HockeyG.R.J. (1986). Changes in operational efficiency as a function of environmental stress, fatigue, and circadian rhythms. In BoffK.R.KaufmanL.ThomasJ.P., Handbook of Perception and Human Performance, Vol. II: Cognitive Processes and Performance. New York: Wiley.
12.
IampietroP.F.ChilesW.D.HigginsE.A.GibbonsH.L. (1969). Complex performance during exposure to high temperatures. Aerospace Medicine40, 1331–1335.
13.
Irwin-ChaseH.Bu*rnsB. (in press). Developmental changes in children's abilities to share and allocate attention in a dual-task. Journal of Experimental Child Psychology.
14.
KobrickJ.LFineB.J. (1983). Climate and human performance. In OborneD.J.GrunebergM.N., The physical environment at work. Chichester: Wiley.
15.
MackworthN.H. (1950). Research on the measurement of human performance. Medical Research Council. Special Report Series 268. (London, HMSO), 156.
16.
MackworthN.H. (1961). Researches on the measurement of human performance. Selected Papers on Human Factors in the Design and Use of Control Systems (Dover, New York), 174–331.
17.
PeplerR.D. (1953). The effect of climatic factors on the performance of skilled tasks by young European men living in the tropics. Medical Research Council, A.P.U. Rept. Nos. 153, 154, 156, 196, 197.
18.
PeplerR.D. (1963). Performance and well-being in heat. In HardyJ.D., Temperature: Its Measurement and Control in Science and Industry, Reinhold: New York.
19.
PoultonE.C. (1970). Environment and Human Efficiency. Charles C. Thomas: Springfield.
20.
ProvinsK.ABellC.R. (1970). Effects of heat stress on the performance of two tasks running concurrently. Journal of Experimental Psychology, 85, 40–41.
21.
RamseyJ.D., (1995). Task performance in heat: A review. Ergonomics38 (1), 154–165.
22.
RamseyJ.D.MorrisseyS.J. (1978). Isodecrement curves for task performance in hot environments. Applied Ergonomics, 9 (2), 66–72.
23.
SombergB.L.SalthouseT.A. (1982). Divided attention abilities in young and old adults. Journal of Experimental Psychology: Human Perception and Performance, 8 (5), 651 – 663.
24.
WingJ.F. (1965). A review of the effect of high ambient temperature on mental performance. AMRL-TR, 65–102. Aerospace Medical Research Laboratories: Ohio.
