This paper describes two experiments on the temporal differences in expressions for the following three types of laughter: “Spontaneous Laughter” caused by funny video clips, “Forced Laughter” evoked during uninteresting comedy clips, and “Extreme Forced Laughter” evoked only by instructions. In the first measurement experiment, facial muscle activity from the orbicularis oculi and zygomatic muscle region, and respiratory changes, were recorded for 15 male and 17 female subjects. The start times of their reactions were analyzed. The subjects took the Yatabe-Guilford personality test, and were classified into two groups: sociable or unsociable. The results showed significantly different time lags between eye and respiratory changes among the three types of laughter. They also showed significantly different time lags between eye and mouth responses in the sociable-male and unsociable-female groups. In the second observation experiment, 12 male and 13 female observers watched the first experiment's subjects' behaviors which were videotaped. They were asked to rate the naturalness of the laughter expressions. The observers' ratings were not very accurate. The ratings were significantly different in the gender of the subjects and the observers.

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While walking through a life space, it was assumed that different areas of visual field was applied and was used for walking at each situation with which pedestrian is faced. In this study, the visual area applied with each walking situation was checked by the method of “Restricted Visual Field”. The following results were obtained: 1) The visual area is extended in different directions while walking through a corridor or through staircases. However, at every situation, the tendency of extending to “ear side” is found. 2) There are two information needed to exist in the same visual area to walk trough a corner or staircases more smoothly, “edge of corner” and the information beside the “edge” (back of the “edge”), “the first step before descending” and the information under the “step” (near body).

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The effects of bathing on recovery from mental fatigue were verified using the latency and the amplitude of event related potential (ERP). The effect of the lukewarm bathing that is regarded as effective for the recovery from mental fatigue was examined. The difference of the degree of recovery was compared between the bathing and non-bathing conditions. As a result, the degree of recovery of both P300 amplitude and latency tended to be greater for the bathing condition than for the non-bathing condition. The degree of recovery was defined as the changes of P300 latency and amplitude after 60min from the completion of an experimental task as compared to those immediately after the completion of the task. The rating score of mental fatigue after 60min from the end of the task decreased more prominently in the bathing condition than in the non-bathing condition. In conclusion, it was verified that the lukewarm bathing worked for recovering from mental fatigue.

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