Temporal and spectral properties of sustaining cells in the medulla of the locust
- 29 Downloads
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
Unable to display preview. Download preview PDF.
- Barlow HB (1981) Critical limiting factors in the design of the eye and visual cortex. Proc R Soc Lond B 212:1–34Google Scholar
- Desimone R, Schein SJ, Moran J, Ungerleider LG (1985) Contour, color and shape analysis beyond the striate cortex. Vision Res 25:441–452Google Scholar
- Gur M, Purple RL (1979) Some temporal output properties of color opponent units in the ground squirrel retina. Brain Res 166:233–244Google Scholar
- Honegger HW (1980) Receptive fields of sustained medulla neurons in crickets. J Comp Physiol 136:191–201Google Scholar
- Horridge GA, Scholes JH, Shaw S, Tunstall J (1965) Extracellular recordings from single neurons in the optic lobe and brain of the locust. In: Treherne JE, Beament JWE (eds) The physiology of the insect central nervous system. Academic Press, London New York, pp 165–202Google Scholar
- Howard J (1981) Temporal resolving power of the photoreceptors ofLocusta migratoria. J Comp Physiol 144:61–66Google Scholar
- Kien J, Menzel R (1977) Chromatic properties of interneurons in the optic lobes of the bee. I. Broad band neurons. J Comp Physiol 113:17–34Google Scholar
- Kuffler SW (1953) Discharge patterns and functional organisation of the mammalian retina. J Neurophysiol 16:37–68Google Scholar
- Kuster JE, French AS (1985) Changes in the dynamic properties of locust photoreceptors at three levels of light adaptation. Biol Cybern 52:333–337Google Scholar
- Lillywhite PG (1978) Coupling between photoreceptors revealed in a quantum bump study. J Comp Physiol 125:13–27Google Scholar
- Osorio D (1986a) Directionally selective cells in the locust medulla. J Comp Physiol A 159:841–847Google Scholar
- Osorio D (1986b) Ultraviolet sensitivity and spectral opponency in the locust. J Exp Biol 122:193–208Google Scholar
- Osorio D (1987) The temporal properties of nonlinear, transient cells in the locust medulla. J Comp Physiol A 161:431–440Google Scholar
- Rowell CHF, O'Shea M, Williams JLD (1977) The neuronal basis of a sensory analyser, the acridid movement detector system. IV. The preference for small field stimuli. J Exp Biol 68:157–186Google Scholar
- Schwarzenbach J, Gill KF (1984) System modelling and control. 2nd edn. Arnold, LondonGoogle Scholar
- Shadlen M, Carey T (1986) Mechanisms of human motion perception revealed by a new cyclopean illusion. Science 232:95–97Google Scholar
- Shapley R, Lennie P (1985) Spatial frequency analysis in the visual system. Annu Rev Neurosci 8:547–583Google Scholar
- Srinivasan MV, Laughlin SB, Dubs A (1982) Predictive coding: a fresh look at inhibition in the retina. Proc R Soc Lond B 216:427–459Google Scholar
- Troy JB (1983) Spatio-temporal interaction in neurones of the cat's dorsal lateral geniculate nucleus. J Physiol 344:419–432Google Scholar
- Wiersma CAG, Roach JLM, Glantz RM (1982) Neural integration in the optic system. In: Atwood HL, Sandeman DC (eds) The biology of Crustacea, vol 4. Academic Press, New York, pp 1–31Google Scholar
- Wilson M (1975) Angular sensitivity of dark and light adapted locust retinula cells. J Comp Physiol 97:323–328Google Scholar