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Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Parallel Processing

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Gestalt Principles of Perception

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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...

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Related Experiment Video

Updated: Jun 19, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Accumulation of visual information across multiple fixations.

Yoni Pertzov¹, Galia Avidan, Ehud Zohary

¹The Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem, Israel. pertzov@gmail.com

Journal of Vision

|October 9, 2009

Summary

Repeatedly looking at an object enhances visual memory, even when conscious awareness is low. More fixations on a target object improve memory recall, demonstrating information accumulation.

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Eye Movement Monitoring of Memory

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Published on: August 15, 2010

Area of Science:

Cognitive Psychology
Neuroscience
Visual Perception

Background:

Humans frequently fixate on the same objects in a visual scene, often unconsciously.
Understanding the mechanisms of visual information accumulation during repeated viewing is crucial for comprehending memory formation.

Purpose of the Study:

To investigate how visual information is accumulated across recurrent fixations on a single object.
To determine if repeated sampling of an object directly enhances memory performance.

Main Methods:

Participants viewed arrays of objects and reported on visual aspects of a target object.
Memory performance was analyzed in relation to the number of fixations on the target and post-target objects.
A second experiment controlled for post-target fixations by removing the stimulus after a set number of target fixations.

Main Results:

Memory performance decreased with increased post-target fixations.
Memory performance improved with more fixations on the target object.
This improvement persisted even when post-target fixations were strictly controlled, indicating true information accumulation.

Conclusions:

Repeated sampling of a visual object monotonically enhances various aspects of memory.
Information accumulation occurs with recurrent fixations, supporting theories of active visual information processing.