Chromatic properties of interneurons in the optic lobes of the bee

SummaryThe chromatic properties of single units in the optic medulla and lobula of the worker bee were examined. This paper describes the spectral sensitivity, S (λ) and the receptive fields of “broad band” units, ie. those neurons which receive qualitatively similar inputs from 2 or 3 colour receptor types.The simplest broad band unit responds with sustained excitation or inhibition to light of all colours. Intracellular staining has identified the sustained excitatory unit as the Y8 cell of the proximal medulla.More complex broad band units may receive a variety of colour inputs which sum with different weighting factors or the colour inputs may have different temporal patterning.Receptive fields tend to be large (diameter greater than 60°). The simplest broad band units show homogenous receptive fields which are uniform for all colours. More complex receptive fields contain different areas where different colours evoke an optimal response. No centre-sourround spatial antagonism was found.

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