Dissociable Effects of Attention and Prediction on Visual Processing: Evidence From Overlap-Corrected Visual ERPs.

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• The influence of top-down factors like spatial attention and prediction on early visual processing in the primary visual cortex (V1) remains unclear in humans.
• Previous electroencephalography (EEG) studies examining the retinotopic C1 event-related potential (ERP) from V1 have yielded inconsistent findings.
• Heterogeneity in results may stem from a focus on attention alone, overlooking prediction's role, and the C1 component's sensitivity to stimulus features and individual differences.

Purpose of the Study:

• To investigate whether early sensory processing in human V1 is modulated by spatial attention and prediction.
• To develop a novel experimental paradigm for the factorial manipulation of spatial attention and prediction, optimizing for C1 component properties.
• To clarify the distinct roles of attention and prediction in visual processing, particularly concerning early V1 activity versus later ERP components.

Main Methods:

• Developed a gaze-contingent eye-tracking paradigm to precisely control visual stimuli and confirm peripheral vision use.
• Factorially manipulated spatial attention (directed peripherally vs. centrally) and prediction.
• Utilized an independent localizer to tailor experiments to individual participants, accounting for C1 response variability.
• Applied linear deconvolution to correct for overlapping event-related potential (ERP) responses.

Main Results:

• Initially, a significantly smaller C1 amplitude was observed when attention was directed towards peripheral stimuli compared to central stimuli.
• This attention-related C1 amplitude effect disappeared after applying linear deconvolution to correct for temporal overlap.
• Spatial attention primarily influenced the P1 ERP component, while prediction predominantly affected the P3 ERP component.

Conclusions:

• Early sensory processing in the primary visual cortex (V1) is not directly modulated by spatial attention or prediction.
• The effects of attention and prediction on visual processing are dissociable.
• These cognitive influences manifest in later event-related potential (ERP) components, specifically the P1 (attention) and P3 (prediction), rather than early V1 activity.