Relative spectral sensitivity and reverse purkinje shift in identified L neurons of the ocellar retina

1981 ◽  
Vol 144 (1) ◽  
pp. 91-97 ◽  
Author(s):  
P. G. Mobbs ◽  
R. G. Guy ◽  
L. J. Goodman ◽  
R. L. Chappell
Keyword(s):  
Spectral Sensitivity ◽  
Purkinje Shift

scholarly journals A Purkinje shift in the spectral sensitivity of grey squirrels

1966 ◽  
Vol 186 (2) ◽  
pp. 439-450 ◽  
Author(s):  
Priscilla H. Silver
Keyword(s):  
Spectral Sensitivity ◽  
Purkinje Shift ◽  
Grey Squirrels

The harp seal, Pagophilus groenlandicus (Erxleben 1777). XXIII. Spectral sensitivity

1972 ◽  
Vol 50 (9) ◽  
pp. 1197-1206 ◽  
Author(s):  
D. M. Lavigne ◽  
K. Ronald
Keyword(s):  
Spectral Sensitivity ◽  
Dark Adaptation ◽  
Relative Sensitivity ◽  
Visual Sensitivity ◽  
Harp Seal ◽  
Scotopic Sensitivity ◽  
Underwater Environment ◽  
Pagophilus Groenlandicus ◽  
Increased Sensitivity ◽  
Purkinje Shift

Behavioral determinations of harp seal spectral sensitivity, under light- and dark-adapted conditions, indicated the presence of a Purkinje shift. Maximum photopic sensitivity occurred near 550 nm. Scotopic sensitivity peaked in the region of 500–525 nm. A large increase in relative sensitivity, approaching 8 log units at 525 nm, accompanied dark adaptation. This confirms anatomical suggestions that the harp seal possesses excellent visual sensitivity. Increased sensitivity to green wavelengths may indicate adaptation to a particular underwater environment.

The electroretinogram of the rhodopsin knockout mouse

1999 ◽  
Vol 16 (2) ◽  
pp. 391-398 ◽  
Author(s):  
KAZUSHIGE TODA ◽  
RONALD A. BUSH ◽  
PETER HUMPHRIES ◽  
PAUL A. SIEVING
Keyword(s):  
Spectral Sensitivity ◽  
Knockout Mouse ◽  
Wave Amplitude ◽  
Threshold Intensity ◽  
Wild Type ◽  
Normal Numbers ◽  
Outer Segments ◽  
Minimal Cone ◽  
Cone Function ◽  
Purkinje Shift

The electroretinogram (ERG) of the rhodopsin knockout (rho−/−) mouse of Humphries et al. (1997) (Humphries et al., 1997) was studied for evidence of light-evoked rod activity and to describe the cone function. The rho−/− retina develops normal numbers of rod and cone nuclei, but the rods have no outer segments, and no rhodopsin is found by immunohistochemistry. The dark-adapted ERG threshold was elevated 4.7 log units above wild-type (WT) control mice, indicating that any residual rod responses were reduced >50,000-fold, consistent with a complete functional knockout. The dark-adapted rho−/− ERG had a cone waveform, and the spectral sensitivity peaked near 510 nm for both dark-adapted and light-adapted conditions, without evidence of a Purkinje shift. The light-adapted ERG b-wave amplitude of young rho−/− mice was the same as WT. The amplitude remained steady up to postnatal day P47, but thereafter it declined to only 1–2% by P80 when no cone outer segments remained. Cone b-wave threshold of dark-adapted rho−/− mice was −1.07 ± 0.39 log cd-s/m2 (n = 17), which is 1.27 log units more sensitive than light-adapted thresholds against a rod-suppressing Ganzfeld background of 1.61 log scotopic cd/m2. This indicates that dark-adapted WT responses to still dimmer stimuli are exclusively rod driven with minimal cone intrusion. Above this cone threshold intensity, the dark-adapted b-wave of WT will be a summation of rod and cone responses. Threshold versus intensity (TVI) studies gave no evidence of a rod influence on the mouse cone b-wave.

Electroretinal Demonstration of a Purkinje Shift in the Chicken Eye

1956 ◽  
Vol 186 (2) ◽  
pp. 258-262 ◽  
Author(s):  
John C. Armington ◽  
Frederick C. Thiede
Keyword(s):  
Absorption Spectrum ◽  
Spectral Sensitivity ◽  
Small Contribution ◽  
Sensitivity Curve ◽  
Experimental Animals ◽  
Scotopic Sensitivity ◽  
Mixed Response ◽  
Purkinje Shift ◽  
Photopic Erg

Spectral sensitivity of the chicken electroretinogram was determined for the photopic and scotopic condition. Physiological procedures were adopted which permitted the examination of the same three experimental animals upon repeated experimental occasions. It was found that this ERG exhibits components which are typical of the eyes of other animals, and a Purkinje shift could be demonstrated. Photopic ERG sensitivity agreed with the absorption spectrum of iodopsin. The form of the scotopic sensitivity curve suggested a mixed response in which the visual purple of the rods dominated, but in which a small contribution was made by the photopic iodopsin system.

Spectral sensitivity and purkinje shift in the retina of the lemon shark, Negaprion brevirostris (Poey)

1977 ◽  
Vol 17 (7) ◽  
pp. 787-792 ◽  
Author(s):  
Joel L. Cohen ◽  
Samuel H. Gruber ◽  
Duco I. Hamasaki
Keyword(s):  
Spectral Sensitivity ◽  
Lemon Shark ◽  
Negaprion Brevirostris ◽  
Purkinje Shift

The effect of field size and position on mesopic spectral sensitivity

1963 ◽  
Author(s):  
Jo Ann S. Kinney
Keyword(s):  
Spectral Sensitivity ◽  
Field Size

Selection of Spectral Sensitivity for Optical Systems Used in Studying the Earth from Space

1975 ◽  
Vol 116 (8) ◽  
pp. 746
Author(s):  
Yu.M. Chesnokov ◽  
V.A. Kottsov
Keyword(s):  
Spectral Sensitivity ◽  
Optical Systems ◽  
The Earth ◽  
Selection Of

Quantifying Spectral Sensitivity Mismatch Using a Metameric Color Rule

2018 ◽  
Vol 62 (5) ◽  
pp. 50402-1-50402-6
Author(s):  
David R. Wyble ◽  
Roy S. Berns
Keyword(s):  
Spectral Sensitivity

scholarly journals In search of the spectral composition of an effective light trap for the mushroom pest Lycoriella ingenua (Diptera: Sciaridae)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sándor Kecskeméti ◽  
András Geösel ◽  
József Fail ◽  
Ádám Egri
Keyword(s):  
Light Intensity ◽  
Spectral Sensitivity ◽  
Fungal Pathogens ◽  
Light Trap ◽  
Spectral Composition ◽  
Wavelength Dependence ◽  
Crop Damage ◽  
Photon Flux ◽  
Compound Eyes ◽  
Behavioural Experiments

AbstractCertain fungus gnats, like Lycoriella ingenua are notorious pests in agriculture, especially in mushroom production. While larvae cause mainly direct crop damage, adults are vectors of several dangerous fungal pathogens. To promote the development of pesticide-free management methods, such as light trapping, we measured the spectral sensitivity of L. ingenua compound eyes with electroretinography and performed two different behavioural experiments to reveal the wavelength dependence of phototaxis in this species. The spectral sensitivity of the compound eyes is bimodal with peaks at 370 nm (UV) and 526 nm (green). Behavioural experiments showed that attraction to light as a function of wavelength depends on light intensity. In our first experiment, where the minimal photon flux (105–109 photons/cm2/s) needed for eliciting a phototactic response was determined wavelength by wavelength, phototaxis was strongest in the green spectral range (~526 nm). In the other behavioural experiment, where wavelength preference was tested under a higher but constant light intensity (~1013 photons/cm2/s), the highest attraction was elicited by UV wavelengths (398 nm). Our results suggest that both UV and green are important spectral regions for L. ingenua thus we recommend to use both UV (~370-398 nm) and green (~526 nm) for trapping these insects.

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