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Moreover, the effects of spatial attention on the recently discovered ERP signature of evidence accumulation\u2014the central parietal positivity (CPP)\u2014have not been fully characterized. The present study assessed the effect of spatial attention on the C1 and CPP components through a spatially cued contrast discrimination task using stimuli that were specifically designed to produce large-amplitude C1 responses and that varied in sensory evidence strength to characterize the CPP. Participants responded according to which of two checkerboard stimuli had greater contrast following an 80% valid cue toward the upper or lower visual field. Prestimulus alpha power changed topographically based on the cue, suggesting participants shifted attention to prepare for the upcoming stimuli. Despite these attentional shifts in alpha power and the fact that the stimuli reliably elicited C1 responses several times greater than many prior studies, there was no evidence of an attention effect on the C1. The CPP, however, showed a clear increase in build-up rate on valid trials. Our findings suggest that endogenous attention may not affect the early C1 ERP component but may improve behavior at a decision stage, as reflected in brain signals related to evidence accumulation (the CPP).<\/jats:p>","DOI":"10.1162\/jocn_a_02239","type":"journal-article","created":{"date-parts":[[2024,8,15]],"date-time":"2024-08-15T14:31:35Z","timestamp":1723732295000},"page":"2481-2494","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":3,"title":["Endogenous Attention Affects Decision-related Neural Activity but Not Afferent Visual Responses"],"prefix":"10.1162","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9143-0708","authenticated-orcid":true,"given":"Audrey","family":"Morrow","sequence":"first","affiliation":[{"name":"University of California, Santa Cruz"}]},{"given":"April","family":"Pilipenko","sequence":"additional","affiliation":[{"name":"University of California, Santa 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