Summary
Contour orientation discrimination accuracy is determined by the orientation bandwidth, response variance and response strength of single units that code for orientation. We measured the latter three properties for V1 cells of monkeys which were performing an orientation discrimination of the grating stimulating the cell under study. We recorded from 285 cells, of which 76% responded to the grating. The orientation bandwidth, measured as full width at half height of the tuning curve, varied over a wide range amongst cells. The median bandwidth was 41 degrees. The response variance of the cells also varied considerably between cells; on average it was about two times the response strength. We also studied the temporal properties of the responses. Most of our cells had a latency between 40 and 100 ms. The response variance was found to be smaller in the initial phases of the response than at the later response stages. In some cells the orientation tuning varied in successive stages of the response, while in others the orientation bandwidth and preferred orientation remained stable throughout the response. However, all orientation sensitive cells were orientation tuned from the start of the response, a property which contribute to the fast and reliable coding of contour orientation. These results provide for the first time an estimation of the orientation tuning properties of V1 cells during visual orientation discrimination. They will be very useful to compare single cell properties of other areas to as well as in simulation studies of models of primate visual discriminations.
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References
Barlow HB (1972) Single units and sensation: a neuron doctrine for perceptual psychology? Perception 1: 371–394
Bradley A, Skottun BC, Ohzawa I, Sclar G, Freeman RD (1987) Visual orientation and spatial frequency discrimination: a comparison of single neurons and behavior. J Neurophysiol 57: 755–772
Burbeck CA, Regan D (1983) Independence of orientation and size in spatial discriminations. J Opt Soc Am 73: 1691–1694
Creutzfeldt OD, Weber H, Tanaka M, Lee B (1987) Neuronal representation of spectral and spatial stimulus aspects in foveal and parafoveal area 17 of the awake monkey. Exp Brain Res 68: 541–564
DeValois RL, Yund EW, Hepler N (1982) The orientation and direction selectivity of cells in macaque visual cortex. Vis Res 22: 531–544
Dinse HRO, Krueger K, Best J, Mallot HA, von Seelen W (1988) Organization and properties of receptive fields of cortical neurons (areas 17,18,19 and PMLS) are time-variant. Soc Neurosci Abstr 14: 202
Ellaway PH (1978) Cumulative sum technique and its application to the analysis of peristimulus time histograms. EEG Clin Neurophysiol 45: 302–304
Georgopoulos AP, Schwartz AB, Kettner RE (1986) Neuronal population coding of movement direction. Science 233: 1416–1419
Haenny PE, Schiller PH (1988) State dependent activity in monkey visual cortex. Exp Brain Res 69: 225–244
Heggelund P, Albus K (1978) Response variability and orientation discrimination of single cells in striate cortex of the cat. Exp Brain Res 32: 197–211
Howard IP (1982) Human visual orientation. Wiley, Chichester UK.
Hubel DH, Wiesel TN (1968) Receptive fields and functional architecture of monkey striate cortex. J Physiol (Lond) 195: 215–243
Ikeda H, Wright MJ (1974) Sensitivity of neurones in visual cortex under different levels of anesthesia. Exp Brain Res 20: 417–484
Judge SJ, Richmond BJ, Chu FC (1980) Implantation of magnetic search coils for measurement of eye positions: an improved method. Vis Res 20: 535–538
Lee C, Rohrer WH, Sparks DL (1988) Population coding of saccadic eye movements by neurons in the superior colliculus. Nature 332: 357–360
Levick WR, Thibos LN (1982) Analysis of orientation bias in cat retina. J Physiol (Lond) 329: 243–261
Livingstone MS, Hubel DH (1981) Effects of sleep and arousal in the processing of visual information in the cat. Nature 291: 554–561
Noda H, Freeman Jr RB, Creutzfeldt OD (1972) Neuronal correlates of eye movements in the visual cortex of the cat. Science 175: 661–664
Orban GA (1984) Neuronal operations in the visual cortex. Springer, Berlin
Orban GA, Vandenbussche E, Vogels R (1984) Human orientation discrimination tested with long stimuli. Vis Res 24: 121–128
Orban GA, Devos M, Vogels R (1990) Cheapmonkey: comparing an ANN and the primate brain on a simple perceptual taskorientation discrimination. Proceed NATO ARW Neurocomputing, algorithms, architectures and applications (in press)
Paradiso MA (1988) A theory for the use of visual orientation information which exploits the columnar structure of striate cortex. Biol Cybern 58: 35–49
Paradiso MA, Carney T, Freeman RD (1989) Cortical processing of hyperacuity tasks. Vis Res 29: 247–254
Parker A, Hawken M (1985) Capabilities of monkey cortical cells in spatial resolution tasks. J Opt Soc Am A 2: 1101–1114
Parker A, Hawken M (1988) Two-dimensional spatial structure of receptive fields in monkey striate cortex. J Opt Soc Am A 5: 598–605
Poggio GF, Doty RW, Talbot WH (1977) Foveal striate cortex of behaving monkey: single-neuron responses to square-wave gratings during fixation of gaze. J Neurophysiol 40: 1369–1391
Regan D, Beverley KI (1985) Postadaptation orientation discrimination. J Opt Soc Am A 2: 147–155
Schiller PH, Finlay BL, Volman SF (1976) Quantitative studies of single-cell properties in monkey striate cortex. II. Orientation specificity and ocular dominance. J Neurophysiol 39: 1320–1333
Suzuki H, Azuma M (1976) A glass insulated ‘Elgiloy’ microelectrode for recording unit activity in chronic monkey experiments. EEG Clin Neurophysiol 41: 93–95
Swindale NV, Cynader MS (1986) Vernier acuity of neurones in cat visual cortex. Nature 319: 591–593
Trotter Y, Thorpe SJ, Celebrini S, Pouget A, Jimbert M (1989) Processing of Orientation in V1 of the auske monkey. Soc Neurosci Abstr 15: 1056
Vidyasagar TR, Urbas JV (1982) Orientation sensitivity of cat LGN neurones with and without inputs from visual cortical areas 17 and 18. Exp Brain Res 46: 157–169
Vogels R (1990) Population coding of stimulus orientation by striate cortical cells. Biol Cybern (in press)
Vogels R, Orban GA (1985) The effect of practice on the oblique effect in line orientation discrimination. Vis Res 11: 1679–1687
Vogels R, Orban GA (1986) Decision processes in visual discrimination of line orientation. J Exp Psychol Human Percept Perform 12: 115–132
Vogels R, Orban GA (1990) How well do response changes of striate neurons signal differences in orientation: a study in the discriminating monkey. J Neurosci (in press)
Vogels R, Spileers W, Orban GA (1989) The response variability of striate cortical neurons in the behaving monkey. Exp Brain Res 17: 432–436
Westheimer G, Shimamura K, McKee SP (1976) Interference with line orientation sensitivity. J Opt Soc Am 66: 332–338
Wurtz RH, Goldberg ME, Robinson DL (1980) Behavioral modulation of visual responses in the monkey: stimulus selection for attention and movement. Progr Psychobiol Physiol Psychol 9: 43–83
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Vogels, R., Orban, G.A. Quantitative study of striate single unit responses in monkeys performing an orientation discrimination task. Exp Brain Res 84, 1–11 (1991). https://doi.org/10.1007/BF00231757
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DOI: https://doi.org/10.1007/BF00231757