Fixational eye movements across vertebrates: comparative dynamics, physiology, and perception.

Area of Science:

• Neuroscience
• Ophthalmology
• Comparative Biology

Background:

• Human eyes exhibit continuous, involuntary fixational eye movements during visual tasks.
• These movements are essential for overcoming neural adaptation and preventing visual fading, aiding perception.
• Recent research has focused on human and primate fixational eye movements and their effects.

Purpose of the Study:

• To provide a comprehensive comparison of fixational eye movements across different species.
• To review five decades of research on fixational eye movements in non-human vertebrates.
• To discuss the physiological and perceptual consequences of these movements in non-human vertebrates.

Main Methods:

• Systematic review of five decades of scientific literature on fixational eye movements.
• Analysis of existing evidence on the physiological and perceptual effects of these movements.
• Compilation of a summary table detailing physical parameters of fixational eye movements in non-human vertebrates.

Main Results:

• Fixational eye movements are a conserved phenomenon across non-human vertebrates.
• Evidence suggests significant physiological and perceptual consequences of these movements in various species.
• A detailed table categorizing fixational eye movement parameters across species is provided.

Conclusions:

• Fixational eye movements play a vital role in visual perception and neural processing across the animal kingdom.
• This review highlights the need for further comparative research to fully understand their function.
• The provided data facilitates future studies on the evolution and mechanisms of vision.