Environmental determinants of altruism: The effects of stimulus overload and perceived control on helping

In an experiment designed to measure the effects of stimulus overload on altruism, 60 female subjects were randomly assigned to three stimulus conditions of 20 subjects each: (1) overload, (2) overload with perceived control, and (3) no overload. Subjects performed simultaneous proofreading and number attention tasks while at the same time listening to distracting or nondistracting background sound, and one group believed they could have the sound turned off if they desired. Following task performance, all subjects received a request for a favor from an ostensibly unrelated confederate. Although all subjects performed the tasks about equally well regardless of stimulus condition, altruism increased significantly across the three conditions. Results were discussed in terms of stimulus overload associated with the urban environment.     

Effects of personal causation and perceived control on responses to an aversive environment: The more control,the better

A laboratory experiment was conducted to investigate the effects on reactions to aversive noise of three types of personal control: control over the initiation of noise, control over its termination, and combined control over both initiation and termination. On an attention-to-detail measure which occurred concurrently with noise stimulation, subjects' error rates decreased linearly as degree of control increased. Likewise, on a post-noise measure of task persistence, subjects' performance rates increased linearly across the three conditions as degree of control increased. Results were discussed in terms of Seligman's theory of learned helplessness and deCharms' theory of personal causation, and the motivational effects of personal control were emphasized.     

Emergent social identity and observing social support predict social support provided by survivors in a disaster: Solidarity in the 2010 Chile earthquake

Survivors of disasters commonly provide each other with social support, but the social‐psychological processes behind such solidarity behaviours have not been fully explicated. We describe a survey of 1240 adults affected by the 2010 Chile earthquake to examine the importance of two factors: observing others providing social support and social identification with other survivors. As expected, emotional social support was associated with social identification, which in turn was predicted by disaster exposure through common fate. Observing others' supportive behaviour predicted both providing emotional social support and providing coordinated instrumental social support. Expected support was a key mediator of these relationships and also predicted collective efficacy. There was also an interaction: social identification moderated the relationship between observing and providing social support. These findings serve to develop the social identity account of mass emergency behaviour and add value to disaster research by showing the relevance of concepts from collective action.