1. Extracellular recordings were made from the dorsal lateral geniculate nucleus of monocularly deprived, dark‐reared and normal cats. The spatial and temporal properties of the neurones were studied. 2. The mean acuity of X‐cells with receptive fields 3 degrees of the area centralis was 3.9 c/degree for deprived eye cells from monocularly deprived cats, compared was 3.8 c/degree for normal cells. 3. The mean activity of X‐cells with receptive fields within 4 degrees of the area centralis was 4.3 c/degree for a dark‐reared cat compared with 4.0 c/degree for a normal cat. 4. The peak response rates of X‐cells to their best spatial frequency were determined. The mean values for the normal, monocularly deprived and dark‐reared populations were all similar. 5 Measurement of the temporal frequency tuning of a number of cells was made. The mean peak temporal frequency for the dark‐reared X‐cells was lower than for monocularly deprived or normal X‐cells. 6. The results are discussed with reference to the location of the primary neural deficit induced by visual deprivation.
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