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Data preprocessing Computations of pupil diameter, saccadic rate, fixation duration, and saccade amplitude were based on measures extracted from the raw data by the software provided by SMI. The pupil diameter measure was based on the right eye of each participant, other measures were based on both eyes. For each of these measures, we averaged the values of each participant in each session.
Introduction Human social interactions show considerable variation in prosocial behaviors—actions intended to benefit the welfare of others. Understanding the contexts and sources of such heterogeneity, including the biological processes which give rise to them, is a key objective of evolutionary psychology (Henrich and Muthukrishna, 2021). In the current paper, we examine the role of acute psychosocial stress in modulating the preference to share with others.
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