extracellular recordings from neurones in the cat 's primary somatosensory cortex ( s1 ) have been made with carbon fibre-filled multibarrel pipettes used for microiontophoresis . gamma-aminobutyric acid ( gaba ) and baclofen elevated the thresholds to tactile and airpuffer stimulation , reduced the sizes of cutaneous receptive fields ( rfs ) , depressed spontaneous activity and decreased the magnitudes of thalamically evoked responses .
C0016904
gamma-aminobutyric acid
C0004609
baclofen