Blocking molecular layer inhibition does not result in beam-like responses. A, Left, The patch-like response in Crus II to stimulation of the ipsilateral vibrissal pad. Top right inset, Thresholded response region covered by grid used to measure the RC and ML extent of the response. Statistical thresholded flavoprotein response is superimposed on the background fluorescence. Right, Application of GABAzine (SR-95531, 200 μm) increases the amplitude and area of the response but does not result in beam-like activation. Also shown in both images is the PF-stimulating electrode used in all experiments to test the integrity of the cerebellar cortex. B, Summary data of the ratio of the extent of the response in the ML and RC directions before (baseline) and after application of the GABAA antagonists, 200 μm GABAzine or 100 μm bicuculline (n = 9 mice).