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Characterisation of columnar neurons and visual signal processing in the medulla of the locust optic lobe by system identification techniques

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Abstract

We describe visual responses of seventeen physiological classes of columnar neuron from the retina, lamina and medulla of the locust (Locusta migratoria) optic lobe. Many of these neurons were anatomically identified by neurobiotin injection. Characterisation of neuronal responses was made by moving and flash stimuli, and by two system identification techniques: 1. The first-order spatiotemporal kernel was estimated from response to a spatiotemporal white-noise stimulus; 2. A set of kernels to second order was derived by the maximal-length shift register (M-sequence) technique, describing the system response to a two-channel centre-surround stimulus. Most cells have small receptive fields, usually with a centre diameter of about 1.5°, which is similar to that of a single receptor in the compound eye. Linear response components show varying spatial and temporal tuning, although lateral inhibition is generally fairly weak. Second-order nonlinearities often have a simple form consistent with a static nonlinear transformation of the input from the large monopolar cells of the lamina followed by further linear filtering.

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Abbreviations

LMC :

large monopolar cell

LVF :

long visual fibre

RF :

receptive field

SMC :

small monopolar cell

SVF :

short visual fibre

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Authors and Affiliations

  1. Centre for Visual Sciences, Australian National University, Box 475, PO ACT 2601, Australia

    A. C. James & D. Osorio

  2. School of Biological Sciences, Sussex University, BN1 9QG, Brighton, UK

    D. Osorio

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  1. A. C. James
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  2. D. Osorio
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James, A.C., Osorio, D. Characterisation of columnar neurons and visual signal processing in the medulla of the locust optic lobe by system identification techniques. J Comp Physiol A 178, 183–199 (1996). https://doi.org/10.1007/BF00188161

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