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• Face stimuli generated by morphing neutral and emotional (angry/happy) images from NimStim5 and Chicago6 face sets to create high (100%) & low (50%) intensity expressions, and included an equal number of open-mouth and closedmouth stimuli. All targets were Caucasian. Half were male, half were female.• Stimuli were presented individually in left or right visual field for 200 ms at 5, 10, or 15. Subjects indicated whether each face was neutral or angry/happy.• Four emotion detection tasks: 2 emotion (angry/happy with neutral)× intensity (low/high). 240 trials per task divided into 3 blocks of 80 trials.• The chief dependent variable was detection performance, or d’.

• Facial emotion perception facilitates social interaction. Advancing age reduces emotion recognition performance, but does not always reduce detection performance. 1, 2 Previous studies comparing younger and older adults’ emotion detection abilities have focused on centrally presented face stimuli. Given agerelated decline in peripheral vision, we examined younger and older adults’ emotion detection performance for peripherally presented faces.• Event-related potentials (ERPs) were used to measure cortical responses to stimuli, including the early posterior negativity (EPN) which is associated with emotion categorization. 3