Cat Color Vision: The Effect of Stimulus Size

Loop, Michael S.; Bruce, Laura L.

doi:10.1126/science.628838

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…The percieved colour was shifted towards the complementary hue by coloured surroundings. In contrast to the findings in cat (Loop & Bruce, 1978) the target size had only a slight influence on perception. Furthermore, the interaction between rods and cones may improve the colour sensitivity of the visual system of man (Reitner et al, 1991).…”

Section: Discussioncontrasting

confidence: 99%

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Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars

Koch

2000

Rev. Bras. Biol.

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The role of colour vision in night-active cats has not been elucidated completely hitherto. In order to assess the colour sensitivity in cat cortical neurons we used large isoluminant computer-generated monochromatic and polychromatic background stimuli which were superimposed on moving and stationary (on/off) light bars. Background stimuli were moved at different speeds either inphase or antiphase. The modulatory effect of the visual noise on the neuronal bar was the primary objective of the study. The maximum amplitudes of some 40% of the neurons tested was influenced by both moving and stationary bars. About two thirds of amplitude-sensitive cells showed aldo altered direction selectivity. Latencies and field widths, on the other hand, turned out to be rather stable. The retino-cortical conduction time was not influenced either. In conclusion, a large portion of cat cortical visual neurons is remarkably sensitive to the spectral composition of the visual noise process surrounding the stimulating light bar.

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Section: Discussioncontrasting

confidence: 99%

“…However, existence of a third cone-type, being sensitive around 500 nm or 600 nm, remains anaissue of discussion (Zrenner & Wienrich, 1981;Ringo et al, 1977). It has been also argued that the visual angle of the deterministic stimulus is decisively influencing the spectral sensitivity of cats (Loop & Bruce, 1978).…”

Section: Introductionmentioning

confidence: 99%

Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars

Koch

2000

Rev. Bras. Biol.

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“…This suggests a dichromatism under usual test conditions similar to that of the cat. Until saturated (and large, as suggested by Loop and Bruce [1978]) stimulus lights are used, the possibility of weak trichromatic discrimination by the cat at photopic levels cannot be excluded.…”

Section: Discussionmentioning

confidence: 99%

“…This reaffirmed the existence of a second cone mechanism in the cat. A partial explanation of the difficulty in training cats to make wavelength discrimination has been furnished by Loop and Bruce (1978), who showed that cats very quickly and easily learn wavelength-discrimination tasks when stimulus spots were large. They concluded that the difficulties encountered in earlier behavioral testing resulted from the use of small stimulus spots.…”

Section: Introductionmentioning

confidence: 99%

Cone contributions to cat retinal ganglion cell receptive fields.

Crocker

Ringo

Wolbarsht

et al. 1980

The Journal of General Physiology

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A B S T R A C TExtracellular microelectrode recordings were made from ganglion cells of the intact, in situ eyes of adult common domestic cats. Three different photopic systems, with peak spectral sensitivities at 450, 500, and 556 nm, were observed. All ganglion cells received input from a cone system with a peak spectral sensitivity of 556 nm. The blue-sensitive cone system was observed in about one-half of the ganglion cells studied. In each case the 450-nm cone system contributed to only one functional type of response, either ON or OFF, in the same cell. The other two photopic systems most often contributed to both the ON and OFF responses of an individual ganglion cell. In four cases the 450-nm cone system mediated responses that were opponent to those of the other two photopic systems. The third photopic mechanism has a peak spectral sensitivity at 500 nm and contributed to most receptive field surrounds and many receptive field centers. It is distinguished from the rod system by the occurrence of a break in both dark-adaptation curves and increment-sensitivity curves. No apparent differences in receptive field cone contributions between brisk-sustained and brisk-transient cells were seen. INTRODUCTIONThe early electrophysiological analysis of the cat retina by Granit (1943 and1948) and his co-workers suggested that there is more than one cone type. Under scotopic conditions, they observed good agreement between the spectral-sensitivity curves of many cat retinal ganglion cells and visual purple data. However, with other ganglion cells, especially under photopic conditions, the curves showed "humps," often at the blue end of the spectrum, but frequently also at the red end. By direct and indirect means they sought to separate the very broad and irregular dominator curves into narrow modulator curves with single peaks. They found so many maximums that the spectral sensitivities of the primary photochemical substances were not clear. They proposed that the various phenomena could be grouped into three regions of the spectrum, and that there were three chromatically distinct cone populations.Until recently, attempts to demonstrate by behavioral tests the existence of wavelength discrimination in the cat have led to negative results or, at most, to positive results that were very difficult to obtain. The work of Gunter (1954) and of Meyer et al. (1954) failed to show any wavelength discrimination in the cat. Sechzer and Brown (1964) succeeded in training cats to distinguish between broad-band green and red lights. Other behavioral studies confirmed that the cat can be trained, although with great difficulty, to distinguish long from short wavelengths (see, e.g., Mellow and Peterson I1964] and Meyer and Anderson [1965]). Daw and Pearlman (1969) examined the wavelength sensitivity of the cat in extracellular recordings from single units in the lateral geniculate and in the optic tract. At background levels exceeding rod saturation according to their tests, they found evidence for only one cone mechanism (556-...

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“…(Loop & Bruce, 1978;Ringo, Wolbarsht, Wagner, Crocker, & Amthor, 1977) may even force us to abandon this notion. In many other respects, cat and human vision are comparable.…”

Section: Outcomementioning

confidence: 99%

The visual system of the cat

Blake¹

1979

Perception & Psychophysics

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Cat Color Vision: The Effect of Stimulus Size

Cited by 9 publications

References 18 publications

Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars

Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars

Cone contributions to cat retinal ganglion cell receptive fields.

The visual system of the cat

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