Early retinotopic responses to violations of emotion–location associations may depend on conscious awareness

Abstract

Reports of modulations of early visual processing suggest that retinotopic visual cortex may actively predict upcoming stimuli. We tested this idea by showing healthy human participants images of human faces at fixation, with different emotional expressions predicting stimuli in either the upper or the lower visual field. On infrequent test trials, emotional faces were followed by combined stimulation of upper and lower visual fields, thus violating previously established associations. Results showed no effects of such violations at the level of the retinotopic C1 of the visual evoked potential over the full sample. However, when separating participants who became aware of these associations from those who did not, we observed significant group differences during extrastriate processing of emotional faces, with inverse solution results indicating stronger activity in unaware subjects throughout the ventral visual stream. Moreover, within-group comparisons showed that the same peripheral stimuli elicited differential activity patterns during the C1 interval, depending on which stimulus elements were predictable. This effect was selectively observed in manipulation-aware subjects. Our results provide preliminary evidence for the notion that early visual processing stages implement predictions of upcoming events. They also point to conscious awareness as a moderator of predictive coding.

Retinotopically specific effects of attention on human early visual cortex activity.

“…In a recent experiment (Herde et al., 2020), we tested this notion by manipulating the density of texture stimuli similar to those used in previous experiments (Herde et al., 2018; Rauss et al., 2009, 2012b). We obtained differential response profiles for the vertical hemifields which only partially matched sensitivity profiles in the literature based on Gabor-like stimuli (De Valois et al., 1982; Tootell et al., 1988).…”