Development of Orientation Tuning in the Visual Cortex of Kittens

Orientation tuning of single units in striate cortex of kittens aged 2–6 weeks was measured quantitatively. Results are based on 227 visually responsive units from 36 kittens of which 9 were reared in complete darkness. Cells were classed as non-oriented (N.O.), orientation-biased (O.B.), and orientation-selective (Or.) using objective criteria. Specificity of O.B. and O.S. cells was gauged using the half-width of the orientation tuning curve at half the maximum response amplitude.

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