EFFECT OF 2 EXPERIMENTAL SETS ON SLEEP STRUCTURE

The effect of 4 perceptual sets.sbd. 1st night in a sleep laboratory, 2nd night in a sleep laboratory, shock avoidance night, and reward night.sbd. on the distribution of sleep was examined with 12 Ss [human subjects]. Both shock avoidance and reward conditions gave results similar to those characteristically found in the 1st night effect, i.e., increases in Stage 0, Stage 1, the latency to Stage 4, the number of awakenings, and the number of stage changes coupled with a decrease in stage 1-REM [rapid eye movement]. The observed effects were minimal and were interpreted as giving evidence for the sturdiness of the sleep process.