ERP evidence of age-related differences in emotional processing.

The present study used event-related potentials (ERPs) to examine differences in the temporal dynamics of emotion processing in young and older adults, with a specific focus on the positivity effect, that is, the preferential processing of positive over negative information. To this aim, we used a language paradigm that allowed us to investigate early ERP components as well as later components, namely the N400 and the late positive complex (LPC). Young and older adults were presented with neutral sentence stems with positive, negative or neutral/semantically-incongruent critical word endings while their electrical brain activity was recorded. There were no effects of emotional valence on early ERP components. Instead, a positivity effect was evident in young adults indexed by reduced N400s for positive sentence endings. Perhaps due to reduced semantic processing abilities, older adults did not show any N400 effect. ERP effects in this group were evident at a later processing stage and took the form of larger LPCs for neutral/incongruent information. Overall, there was no effect of emotional valence on either the N400 or the LPC in older adults. Our data suggest that with age, more effortful semantic processing may deplete resources for emotional processing.