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Optimum spatiotemporal receptive fields for vision in dim light

Författare:
Publiceringsår: 2009
Språk: Engelska
Publikation/Tidskrift/Serie: Journal of Vision
Volym: 9
Nummer: 4
Dokumenttyp: Artikel
Förlag: Association for Research in Vision and Ophthalmology (ARVO)

Sammanfattning

Many nocturnal insects depend on vision for daily life and have evolved different strategies to improve their visual capabilities in dim light. Neural summation of visual signals is one strategy to improve visual performance, and this is likely to be especially important for insects with apposition compound eyes. Here we develop a model to determine the optimum spatiotemporal sampling of natural scenes at gradually decreasing light levels. Image anisotropy has a strong influence on the receptive field properties predicted to be optimal at low light intensities. Spatial summation between visual channels is predicted to extend more strongly in the direction with higher correlations between the input signals. Increased spatiotemporal summation increases signal-to-noise ratio at low frequencies but sacrifices signal-to-noise ratio at higher frequencies. These results, while obtained from a model of the insect visual system, are likely to apply to visual systems in general.

Disputation

Nyckelord

  • Biology and Life Sciences
  • apposition compound eye
  • neural summation
  • receptive field
  • anisotropy
  • optimization
  • signal-to-noise ratio

Övriga

Published
Yes
  • ISSN: 1534-7362

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