Adaptation and exogenous attention interact in the early visual cortex: A TMS study

Area of Science:

• Neuroscience
• Visual Perception
• Cognitive Psychology

Background:

• Transcranial magnetic stimulation (TMS) to the early visual cortex impacts contrast sensitivity and attention.
• The interplay between adaptation, attention, and TMS in V1/V2 remains unclear.

Purpose of the Study:

• To investigate if adaptation modulates exogenous attention under TMS targeting the V1/V2 region.
• To determine how adaptation affects the influence of TMS on attention-driven contrast sensitivity changes.

Main Methods:

• Observers performed an orientation discrimination task with or without prior adaptation.
• TMS was applied to the V1/V2 region during the task.
• Stimuli were presented in the stimulated region and its contralateral symmetric region.
• Performance was assessed under conditions with and without adaptation, and with TMS targeting either the attended or unattended stimulus.

Main Results:

• Without adaptation, TMS eliminated attention's effect on contrast sensitivity when targeting the attended stimulus.
• With adaptation, exogenous attention modulated performance similarly regardless of whether TMS targeted the attended or unattended stimulus.
• Adaptation altered the relationship between TMS, attention, and contrast sensitivity.

Conclusions:

• Adaptation and attention interact within the early visual cortex (V1/V2).
• Adaptation effectively shields exogenous attention from the modulatory effects of TMS in this region.