Hypercomplex cell types in area 18 of the cat

Camarda, Rosolino

doi:10.1007/bf00238477

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…All cells exhibiting end-zone inhibition were C-type cells (cf. hypercomplex cells in area 18 -Hubel & Wiesel, 1965;Orban & Callens, 1977a;Hammond & Andrews, 1978;Camarda, 1979;Harvey, 1980). In two binocular neurons, strong end-zone inhibition was apparent when the neuron was stimulated through either eye.…”

Section: End-zone Inhibitionmentioning

confidence: 98%

Effects of selective pressure block of Y-type optic nerve fibers on the receptive-field properties of neurons in area 18 of the visual cortex of the cat

et al. 1992

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Recordings were made from single neurons in area 18 of anesthetized cats (N2O/O2 mixture supplemented by continuous intravenous infusion of barbiturate) in which one optic nerve had been pressure blocked to selectively block conduction in the largest (Y-type) fibers. Cortical neurons were stimulated visually via the normal eye or via the eye with the pressure-blocked optic nerve (“Y-blocked eye”). Several properties of the receptive fields such as their spatial organization (S or C cells), orientation tuning, and the presence and strength of end-zone inhibition appear to be unaffected by removal of the Y input. By contrast, the removal of the Y input resulted in a small but significant reduction in the size of the discharge field and in the direction-selectivity index. In three respects, peak response discharge rate, eye dominance, and velocity sensitivity, removal of the Y input had strong and highly significant effects. Thus, the mean peak discharge frequency of responses evoked by the stimulation of binocular neurons via the Y-blocked eye was significantly lower than that of responses evoked by the stimulation via the normal eye. Accordingly, the eye-dominance histogram was shifted markedly towards the normal eye (more so than in the homologous experiment conducted on area 17 — Burke et al., 1992). Finally, the mean preferred velocity of responses of cells activated via the normal eye was in the vicinity of 145 deg/s, whereas for cells activated via the Y-blocked eye the value was about 35 deg/s. Overall, the results of the present study imply that (1) apart from Y-type excitatory input there are significant excitatory non-Y-inputs to area 18; these inputs at least partially consist of indirect X-type input relayed via area 17; (2) in neurons of area 18 that receive both Y-type and non-Y-type excitatory inputs, the Y-type input has a major influence on strength of the response and velocity sensitivity and a lesser influence on the direction selectivity and size of the discharge fields; and (3) area 18 contains mechanisms determining such receptive-field properties as S- or C-type organization, orientation tuning, and direction selectivity which can be accessed either by the Y input or by non-Y input.

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Section: End-zone Inhibitionmentioning

confidence: 98%

Effects of selective pressure block of Y-type optic nerve fibers on the receptive-field properties of neurons in area 18 of the visual cortex of the cat

et al. 1992

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“…(1968), Bishop et al (1971a, b), and Sherman et al (1976). Harvey (1980) stressed the reaction of cells to moving bright and dark edges as a criterion of distinction and, like Camarda (1979), distinguished between S, C, and B cells on the one hand, and SH, CH, and BH cells on the other. Hammond and Andrews (1978a, b) use a different terminology and distinguish between complex I cells as similar to simple ones, and complex II as similar to complex, using criteria such as field size, spontaneous firing rate, velocity tuning and orientation tuning.…”

Section: On the Function Of The Cell Systems In Area 18mentioning

confidence: 97%

On the function of cell systems in area 18. Part II

Dinse

Seelen

1981

Biol. Cybern.

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In addition to the asymmetry of the spatial coupling and of the specific temporal combination of excitation and inhibition, the non-linearity is very pronounced in area 18. Taking the sequence of a linear operation and a stationary nonlinear characteristic as a model, the experimental findings can be systematized and cell classification specified which departs from the customary ones. The hypercomplex cell system probably originates in recurrent inhibition and leads to differentiation of the patterns along their contour line. Problems of cell classification and of the type of parallelism in the visual cortex are discussed.

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“…By contrast, strong end-zone inhibition is very common in both areas 17 and 18 especially among the cells in supragranular laminae 2 and 3 (cf. Camarda & Rizzolatti, 1976;Gilbert, 1977;Rose, 1977;Kato et al, 1978;Camarda, 1979;Harvey, 1980;Sherk, 1989) which provide principal associational inputs to area 21a (cf. Dreher, 1986).…”

Section: End-zone Inhibitionmentioning

confidence: 99%

Processing of form and motion in area 21a of cat visual cortex

Dreher

Michalski

et al. 1993

Vis Neurosci

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Extracellular recordings from single neurons have been made from presumed area 21a of the cerebral cortex of the cat, anesthetized with N 2 O/O 2 /sodium pentobarbitone mixture. Area 21a contains mainly a representation of a central horizontal strip of contralateral visual field about 5 deg above and below the horizontal meridian.Excitatory discharge fields of area 21a neurons were substantially (or slightly but significantly) larger than those of neurons at corresponding eccentricities in areas 17, 19, or 18, respectively. About 95% of area 21a neurons could be activated through either eye and the input from the ipsilateral eye was commonly dominant. Over 90% and less than 10% of neurons had, respectively, C-type and S-type receptive-field organization. Virtually all neurons were orientation-selective and the mean width at half-height of the orientation tuning curves at 52.9 deg was not significantly different from that of neurons in areas 17 and 18. About 30% of area 21a neurons had preferred orientations within 15 deg of the vertical.The mean direction-selectivity index (32.8%) of area 21a neurons was substantially lower than the indices for neurons in areas 17 or 18. Only a few neurons exhibited moderately strong end-zone inhibition. Area 21a neurons responded poorly to fast-moving stimuli and the mean preferred velocity at about 12.5 deg/s was not significantly different from that for area 17 neurons.Selective pressure block of Y fibers in contralateral optic nerve resulted in a small but significant reduction in the preferred velocities of neurons activated via the Y-blocked eye. By contrast, removal of the Y input did not produce significant changes in the spatial organization of receptive fields (S or C type), the size of the discharge fields, the width of orientation tuning curves, or direction-selectivity indices.Our results are consistent with the idea that area 21a receives its principal excitatory input from area 17 and is involved mainly in form rather than motion analysis.

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Hypercomplex cell types in area 18 of the cat

Abstract: Single unit recording has revealed the same orientation sensitive cell classes in cat area 18 as are to be found in area 17. These include particularly the various types of hypercomplex cell belonging to the S, C, and B cell families.

Cited by 10 publications

References 10 publications

Effects of selective pressure block of Y-type optic nerve fibers on the receptive-field properties of neurons in area 18 of the visual cortex of the cat

Effects of selective pressure block of Y-type optic nerve fibers on the receptive-field properties of neurons in area 18 of the visual cortex of the cat

On the function of cell systems in area 18. Part II

Processing of form and motion in area 21a of cat visual cortex

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