The temporal dynamics of early visual cortex involvement in behavioral priming.

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Transcranial magnetic stimulation (TMS) offers non-invasive modulation of neural activity.
• Early visual cortex (EVC) TMS in chronometric designs reveals critical timing for conscious vision.
• Behavioral priming suggests visual stimulus impact can be independent of conscious perception.

Purpose of the Study:

• To investigate the temporal effects of EVC TMS on visual processing.
• To determine if TMS-induced suppression of visual awareness dissociates from behavioral priming.
• To assess EVC TMS effects across various time points relative to stimulus onset.

Main Methods:

• Applied TMS to EVC at multiple time points before and after symbolic visual stimuli.
• Measured visual discrimination performance, subjective visibility ratings, and behavioral priming.
• Included electrooculography, sham TMS, and vertex TMS for control.

Main Results:

• EVC TMS disruption patterns for visual discrimination, subjective awareness, and behavioral priming were not dissociable with appropriate controls.
• TMS applied to EVC affected visual perception holistically.
• Disruption occurred irrespective of whether TMS was applied pre- or post-stimulus onset.

Conclusions:

• The temporal dynamics of visual awareness and behavioral priming are not separable by EVC TMS.
• EVC TMS impacts visual perception as a unified process.
• Findings inform models of visual awareness and subliminal priming.