[New visual area on the inferior wall of the cruciate sulcus of the cat brain].
Properties of 187 neurons were studied in the lower bank of that part of cruciate sulcus where electrical stimulation evoked conjugate unidirectional oculomotor saccades. 172 neurons responded to visual stimulation. Neurons in the superficial cortical layers responded to conventional stimuli: light and dark spots or slits stationary or moving with the speed up to 30 degrees/s. These neurons had no orientational selectivity but sometimes showed directional selectivity. In the intermediate layers maximal responses were obtained when a flittering bird was presented to the cat; no responses were observed to conventional stimulation. Main feature of many neurons in the deep layers was selectivity to the motion in the depth in some parts of the visual field. This selectivity was invariant to the direction of contrast between stimulus and background. Visual responses in all layers were seen only in the state of arousal (during desynchronization in EEG) and were absent in the state of quiet wakefulness. All studied neurons showed no responses to acoustic or somatic stimulation. Neurons in the medial wall of the brain under the cruciate sulcus did not respond to visual stimulation but responded in correlation with definite eye movements. It is suggested that in this part of the brain two retinotopically organized areas are present one of which is connected with visual function and another with eye movements.
D000818:Animals; D005075:Biological Evolution; D001931:Brain Mapping; D002415:Cats; D005133:Eye Movements; D005625:Frontal Lobe / Q000033:anatomy & histology / Q000502:physiology*; D000882:Haplorhini; D009039:Motion Perception / Q000502:physiology; D009949:Orientation / Q000502:physiology; D014795:Visual Pathways / Q000033:anatomy & histology*; D014796:Visual Perception / Q000502:physiology*
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