The present study was designed to determine whether or not an increase in ambient temperature impaired man's ability to recall aurally-presented messages, and whether impairment was greater for some types of messages than for others. On three separate days, 15 men were exposed for 1 hour in an allweather chamber to each of three different effective temperatures (ET): 720, 900, and 95"F. During each day's session they were given five successive recall trials on each of six different messages.

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... men had to work continuously during each hour-long session. The results showed that average recall dropped significantly as environmental temperature was increased. The recall decrement between 90* and 95°F was statistically significant, but the drop in recall between 720 and 90 0 F was not significant. Messages of all types suffered approximately equal decrements under the high temperatures. 111io