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Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Related Experiment Video

Updated: May 31, 2026

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research
06:16

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research

Published on: February 2, 2022

Getting home in the dark.

Simon Spiro1, Hal Drakesmith2

  • 1Zoological Society of London, Outer Circle, Regent's Park, London, UK.

Science (New York, N.Y.)
|May 28, 2026
PubMed
Summary
This summary is machine-generated.

Pigeons may use two distinct mechanisms to navigate using Earth's magnetic field, separate from daylight cues. These findings shed light on avian navigation strategies.

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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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Related Experiment Videos

Last Updated: May 31, 2026

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research
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Published on: February 2, 2022

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
09:29

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Area of Science:

  • Ornithology
  • Animal Behavior
  • Geophysics

Background:

  • Pigeons (Columba livia) are known for their remarkable homing abilities.
  • Understanding avian navigation is crucial for ecological and evolutionary studies.

Purpose of the Study:

  • To investigate potential mechanisms enabling pigeons to navigate using Earth's magnetic field.
  • To determine if these mechanisms are independent of daylight cues.

Main Methods:

  • Experimental studies involving pigeons equipped with devices to disrupt magnetic senses.
  • Behavioral observations and analysis of homing performance under various conditions.

Main Results:

  • Evidence suggests at least two distinct magnetic senses are utilized by pigeons.
  • Navigation capabilities were demonstrated even in the absence of visual cues.

Conclusions:

  • Pigeons possess sophisticated mechanisms for magnetoreception, crucial for navigation.
  • These findings contribute to our understanding of biological navigation and sensory biology.