Figure 1. Responses of a cell in the cat's striate cortex to a l deg spot of light.

Receptive field located in the eye contralateral to the hemisphere from which the unit was recorded, close to and below the area centralis, just nasal to the horizontal meridian. No response evoked from the ipsilateral eye. The complete map of the receptive field is shown to the right. ×, areas giving excitation; ▵, areas giving inhibitory effects. Scale, 4 deg. Axes of this diagram are reproduced on left of each record. a, 1 deg (0.25 mm) spot shone in the centre of the field; b–e, 1 deg spot shone on four points equidistant from centre; f, 5 deg spot covering the entire field. Background illumination 0.17 log m.c. Stimulus intensity 1.65 log m.c. Duration of each stimulus 1 s. Positive deflexions upward.