Journal ArticleDOI
The Vertebrate Eye and Its Adaptive Radiation.
TLDR
The conductivity bridge derives its bridge source from a self-contained vacuum tube oscillator adjusted to approximately 1,000 cycles as mentioned in this paper, which operates directly from the A.C. power source.Abstract:
The new Conductivity Bridge derives its bridge source. voltage from a self-contained vacuum tube oscilltor adjusted to approximately 1,000 cycles. Voltage for the amplifier and null indicator tubes is provided by a.builtin D.C. power supply which operates directly from the A.C. power source. 9-324 Conductivity Bridge, without Conductivity Cell, for use with 110 volts 5060 cycle A.C. 9-351.Cosi~uCvity Cell, for use with Conductivity Bridge, constant 0.8, $20.00read more
Citations
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Journal ArticleDOI
The multifunctional choroid.
Debora L. Nickla,Josh Wallman +1 more
TL;DR: It seems that the thickening of the choroid may be mechanistically linked to the scleral synthesis of macromolecules, and thus may play an important role in the homeostatic control of eye growth, and, consequently, in the etiology of myopia and hyperopia.
Journal ArticleDOI
Specific hungers and poison avoidance as adaptive specializations of learning.
Paul Rozin,James W. Kalat +1 more
Book ChapterDOI
A Predator’s View of Animal Color Patterns
TL;DR: In this paper, the authors explore the factors that determine color patterns under various specific conditions and show that the actual pattern evolved in a particular place represents a compromise between factors which favor crypsis and those which favor conspicuous color patterns.
Journal ArticleDOI
Amniote phylogeny and the importance of fossils
TL;DR: The importance of the critical fossils seems to reside in their relative primitive‐ness, and the simplest explanation for their more conservative nature is that they have had less time to evolve.
Journal ArticleDOI
Animal colour vision — behavioural tests and physiological concepts
TL;DR: An overview of the methods used to study animal colour vision is given, and how quantitative modelling can suggest how photoreceptor signals are combined and compared to allow for the discrimination of biologically relevant stimuli is discussed.
References
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Journal ArticleDOI
Retinal photoreceptors and visual pigments in Boa constrictor imperator
TL;DR: The photoreceptors of Boa constrictor, a boid snake of the subfamily Boinae, were examined with scanning electron microscopy and microspectrophotometry and the data indicate that wavelength discrimination above 430 nm would not be possible without some input from the rods.
Journal ArticleDOI
The Absolute Threshold of Colour Vision in the Horse
TL;DR: The behavioural results are in line with calculations of the sensitivity of cone vision where the horse eye and human eye again are similar and the advantage of the large eye of the horse lies not in colour vision at night, but probably instead in achromatic tasks where presumably signal summation enhances sensitivity.
Journal ArticleDOI
The effects of the light environment on prey choice by zebra finches
TL;DR: The removal of long-wavelength information had a greater influence than the removal of shorter wavelengths, including ultraviolet wavelengths for this foraging task, which has important implications for predator-prey interactions and suggest that future studies of natural foraging should consider variations in the light environment.
Journal ArticleDOI
Spectral sensitivity of cones in an ungulate.
Jay Neitz,Gerald H. Jacobs +1 more
TL;DR: Examination with electroretinogram (ERG) flicker photometry revealed the presence of two classes of cones in the pig's eye having average maximum sensitivity (lambda max) at 439 nm and 556 nm, respectively, and this ungulate thus has the requisite retinal basis for dichromatic color vision.