Temporal and spectral properties of sustaining cells in the medulla of the locust
Intracellular recordings were made from of cells in the optic medulla of the locust which give opposite responses to dimming and brightening, and are insensitive to movement within their receptive field. They resemble the sustaining cells described in decapod optic lobe (Wiersma et al. 1982).
The cells' receptive field areas vary from 2° to 30° in diameter. They receive inputs from both green and ultraviolet sensitive photoreceptors.
The responses to stationary flicker are approximately linear, although the cells are more responsive to depolarizing than to hyperpolarizing stimuli.
Cells are tuned to a range of temporal frequencies between 5 Hz and 30 Hz, and bandwidths vary from 1.5–3.5 octaves. Thus there may be range-fractionation of temporal frequencies.
One set of cells which have similar temporal properties but a variety of spectral properties and receptive field areas are examined in more detail. They have a phasotonic response, and their response amplitude and phase can be modelled as an addition of two linear filters. These two inputs may differ in spectral sensitivity, allowing dissection of a complex response into its components.
KeywordsSpectral Property Receptive Field Temporal Property Response Amplitude Spectral Sensitivity
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