During exposure to conditions of high population density and high temperature, human interpersonal affective behavior as indicated by measures of liking or disliking another person was found to be more negative than during exposure to comfortable temperatures and low population density. Additional affective variables were also negatively influenced by temperature and density manipulations. The results parallel those in the animal literature reflecting deterioration of "social relations" under conditions of overcrowding and high temperature. The findings are discussed in the context of current population trends and other environmental conditions.

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News broadcasts conveying “good news” or “bad news” were played to subjects who subsequently made evaluative responses of anonymous others. The news broadcasts were shown to differentially elicit positive and negative affective responses and to affect subjects' evaluations of others. Additionally, reported affect was shown to be positively related to those interpersonal evaluations.