Highlights • Cortical GABA levels correlate with contrast detection thresholds.• GABA appears to reduce contrast response gain and intrinsic noise.• Changes in contrast discrimination can be characterised by the Wilson-Cowan… Click to show full abstract
Highlights • Cortical GABA levels correlate with contrast detection thresholds.• GABA appears to reduce contrast response gain and intrinsic noise.• Changes in contrast discrimination can be characterised by the Wilson-Cowan model.
               
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