scholarly journals Wavelength discrimination in the hummingbird hawkmothMacroglossum stellatarum

2016 ◽  
Vol 219 (4) ◽  
pp. 553-560 ◽  
Author(s):  
Francismeire J. Telles ◽  
Almut Kelber ◽  
Miguel A. Rodríguez-Gironés
Keyword(s):  
Wavelength Discrimination

Wavelength-Discrimination with Only Rods and Blue Cones

1991 ◽  
pp. 67-71
Author(s):  
Andreas Reitner ◽  
Lindsay T. Sharpe ◽  
Eberhart Zrenner
Keyword(s):  
Wavelength Discrimination

scholarly journals Behavioural evidence for polychromatic ultraviolet sensitivity in mantis shrimp

2018 ◽  
Vol 285 (1884) ◽  
pp. 20181384 ◽  
Author(s):  
Michael J. Bok ◽  
Nicholas W. Roberts ◽  
Thomas W. Cronin
Keyword(s):  
Narrow Band ◽  
Visible Range ◽  
Mantis Shrimp ◽  
Visual Systems ◽  
Uv Vision ◽  
Wavelength Discrimination ◽  
Behavioural Experiments ◽  
Polarization Detection ◽  
Behavioural Evidence ◽  
Uv Range

Stomatopod crustaceans are renowned for their elaborate visual systems. Their eyes contain a plethora of photoreceptors specialized for chromatic and polarization detection, including several that are sensitive to varying wavelength ranges and angles of polarization within the ultraviolet (UV) range (less than 400 nm). Behavioural experiments have previously suggested that UV photoreception plays a role in stomatopod communication, but these experiments have only manipulated the entire UV range. Here, using a behavioural approach, we examine UV vision in the stomatopod Haptosquilla trispinosa . Using binary trained choice assays as well as innate burrow-choice experiments, we assessed the ability of H. trispinosa to detect and respond to narrow-band LED stimuli peaking near 314 nm (UVB) versus 379 nm (UVA) in wavelength. We find that H. trispinosa can discriminate these stimuli and appears to display an aversive reaction to UVB light, suggesting segregated behavioural responses to stimuli within the UV range. Furthermore, we find that H. trispinosa can discriminate stimuli peaking near 379 nm versus 351 nm in wavelength, suggesting that their wavelength discrimination in the UV is comparable to their performance in the human-visible range.

Wavelength discrimination (WLD) TOF-PET detector with DOI information

2020 ◽  
Vol 65 (5) ◽  
pp. 055003 ◽  
Author(s):  
Muhammad Nasir Ullah ◽  
Eva Pratiwi ◽  
Jin Ho Park ◽  
Kisung Lee ◽  
Hojong Choi ◽  
...  
Keyword(s):  
Wavelength Discrimination ◽  
Tof Pet

Wavelength discrimination in gray squirrels

1976 ◽  
Vol 16 (3) ◽  
pp. 325-327 ◽  
Author(s):  
G.H. Jacobs
Keyword(s):  
Wavelength Discrimination

scholarly journals THE COLOR VISION OF DICHROMATS

1936 ◽  
Vol 20 (1) ◽  
pp. 57-82 ◽  
Author(s):  
Selig Hecht ◽  
Simon Shlaer
Keyword(s):  
Brightness Distribution ◽  
Short Wave ◽  
Neutral Point ◽  
Long Wave ◽  
Relative Brightness ◽  
Wavelength Discrimination ◽  
The Right ◽  
Spectral Ranges ◽  
Range Of Variation ◽  
Average Position

1. Protanopes and deuteranopes show one maximum of wavelength discrimination which occurs near their neutral point in the region of 500 mµ (blue-green for color-normal). The value of the just discriminable wavelength interval Δλ is about 1 mµ at this point and is much like the normal. To either side of this, Δλ rises. It increases rapidly on the short-wave side, and slowly on the long-wave side, rising to about 50 mµ at the two ends of the spectrum. 2. The brightness distribution in the spectrum for dichromats falls only partly outside the range established for color-normals. The protanope curve is narrower than normal, and its maximum lies nearly 15 mµ to the left of it. The deuteranope curves are about the same width as the normal, and their maxima lie slightly but definitely to the right of it. The main difference between protanope and deuteranope spectrum sensitivity lies on the red side of brightness curves, where the deuteranope is strikingly higher. This difference furnishes the only reliable diagnostic sign which may be applied to an individual dichromat for separating the two types. 3. The average position for the neutral point of twenty-one protanopes is 496.5 mµ; of twenty-five deuteranopes 504.3 mµ. The range of variation in the position of neutral point is twice as great for the deuteranope as for the protanope. 4. Dichromatic gauging of the spectrum cannot yield unique mixture values for any wavelength because of the large stretches of poor wavelength discrimination. Data have therefore been secured which locate the spectral ranges that can match specific mixtures of two primaries when brightness differences are eliminated. The form of the data is much the same for a protanope and for a deuteranope; the only difference is in the relative brightness of the primaries. 5. Previously accepted anomalies in the spectral matching of dichromats which have led to the rejection of the third law of color mixture for them, have been eliminated. They are shown to have been due to the non-uniqueness of color matches and the usually disparate brightnesses of the primaries. Color mixture matches for dichromats are valid at all brightnesses.

scholarly journals Multiple visual pigments in a photoreceptor of the salamander retina.

1996 ◽  
Vol 108 (1) ◽  
pp. 27-34 ◽  
Author(s):  
C L Makino ◽  
R L Dodd
Keyword(s):  
Absorption Spectra ◽  
Visual Pigment ◽  
Photoreceptor Cells ◽  
Visual Pigments ◽  
Wavelength Band ◽  
Absorption Bands ◽  
Maximal Sensitivity ◽  
Retinal Chromophore ◽  
Wavelength Discrimination ◽  
Pigment Absorption

Although a given retina typically contains several visual pigments, each formed from a retinal chromophore bound to a specific opsin protein, single photoreceptor cells have been thought to express only one type of opsin. This design maximizes a cell's sensitivity to a particular wavelength band and facilitates wavelength discrimination in retinas that process color. We report electrophysiological evidence that the ultraviolet-sensitive cone of salamander violates this rule. This cell contains three different functional opsins. The three opsins could combine with the two different chromophores present in salamander retina to form six visual pigments. Whereas rods and other cones of salamander use both chromophores, they appear to express only one type of opsin per cell. In visual pigment absorption spectra, the bandwidth at half-maximal sensitivity increases as the pigment's wavelength maximum decreases. However, the bandwidth of the UV-absorbing pigment deviates from this trend; it is narrow like that of a red-absorbing pigment. In addition, the UV-absorbing pigment has a high apparent photosensitivity when compared with that of red- and blue-absorbing pigments and rhodopsin. These properties suggest that the mechanisms responsible for spectrally tuning visual pigments separate two absorption bands as the wavelength of maximal sensitivity shifts from UV to long wavelengths.

Sign in / Sign up

Export Citation Format

Share Document