Visual thresholds and spectral sensitivities of the grey squirrel (<i>Sciurus carolinensis leucotis</i>)

Arden, G B; Silver, Priscilla H.

doi:10.1113/jphysiol.1962.sp006992

Cited by 29 publications

(14 citation statements)

References 16 publications

(20 reference statements)

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“…Among the family Sciuridae, ground squirrels (Arden & Tansley, 1955b), chipmunks (Tansley, Copenhaver, & Gunkel, 1961), prairie dogs (Walls, 1942), and some tree squirrels (Arden & Silver, 1962) are reported to possess pure-cone retinae. But mere possession of color receptors does not necessarily mean that an animal uses color information.…”

mentioning

confidence: 99%

Evidence for color vision in the prairie dog (Cynomys ludovicianus)

Cain

Carlson

1968

Psychon Sci

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confidence: 99%

Evidence for color vision in the prairie dog (Cynomys ludovicianus)

Cain

Carlson

1968

Psychon Sci

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“…Previous behavioural experiments (Arden & Silver, 1962) on darkadapted and slightly red-light-adapted grey squirrels showed a maximum of sensitivity near 500 nm. It was of some interest to see whether a Purkinje shift could be produced by repeating the behavioural experiments at a daylight level of light adaptation.…”

Section: Introductionmentioning

confidence: 85%

“…The training of the grey squirrels is described in an earlier paper (Arden & Silver, 1962). The animals were trained to go towards a light which appeared either on the right or the left of the far end of the cage when the animal stood on a perch, and to return to this vantage point each time.…”

Section: Methodsmentioning

confidence: 99%

A Purkinje shift in the spectral sensitivity of grey squirrels

Silver¹

1966

The Journal of Physiology

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1. The light-adapted spectral sensitivity of the grey squirrel has been determined by an automated training method at a level about 6 log units above the squirrel's absolute threshold.2. The maximum sensitivity is near 555 nm, under light-adapted conditions, compared with the dark-adapted maximum near 500 nm found by a similar method.3. Neither the light-adapted nor the dark-adapted behavioural threshold agrees with electrophysiological findings using single flash techniques, but there is agreement with e.r.g. results obtained with sinusoidal stimuli.

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“…These measurements are in good agreement with ours at wave-lengths of 430 nm and longer, when the density is less than one, but they deviate markedly at shorter wave-lengths. It seems probable that the results given in Arden & Silver (1962) were disturbed by the presence of stray light in the spectrophotometer (H. J. A.…”

Section: Squirrel Lensmentioning

confidence: 99%

The yellow colour of the lens of the grey squirrel (Sciurus carolinensis leucotis)

Cooper¹,

Robson²

1969

The Journal of Physiology

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SUMMARY1. The absorption spectrum of the lens of the grey squirrel (Sciurus carolinensis leucotis) has been measured, revealing an absorption maximum at 370 nm. Peak densities in the intact lens ranged from 12 to 20.2. This peak is not present in the lenses of horse, cow, pig, dog, cat, ferret (Mustelo furo), or guinea-pig (Cavia porcellus).3. The pigment responsible for this absorption is water-soluble and aqueous extracts have been examined. Protein-free aqueous extracts show an additional maximum at 265 nm, which can only partially be accounted for by the presence of ascorbic acid.4. The absorption spectrum of extracts of lens material from the ground squirrel (Citellu8 mexicanus) also had maxima at 265 and 370 nm.5. Chromatography of the protein-free solution separated two yellow components, both of which had a yellow fluorescence. The faster component had a very similar absorption spectrum to the original protein-free solution.6. Possible functions of the yellow pigment are discussed.

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Visual thresholds and spectral sensitivities of the grey squirrel (Sciurus carolinensis leucotis)

Cited by 29 publications

References 16 publications

Evidence for color vision in the prairie dog (Cynomys ludovicianus)

Evidence for color vision in the prairie dog (Cynomys ludovicianus)

A Purkinje shift in the spectral sensitivity of grey squirrels

The yellow colour of the lens of the grey squirrel (Sciurus carolinensis leucotis)

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