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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.
Once through the pupil, the light passes through the lens, a...

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.

Structuralism

Structuralism

Structuralism, an early psychological theory developed by Wilhelm Wundt and his student Edward Bradford Titchener, sought to dissect the human mind into its most fundamental components. Wundt's groundbreaking work in his laboratory set the stage for Titchener to define structuralism's goal as cataloging the "atoms" of the mind—sensations, images, and feelings—akin to how chemists identify elements of matter.
Titchener's approach to structuralism was unique. He employed introspection, a method...

Parallel Processing

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

Gestalt Principles of Perception

Gestalt Principles of Perception

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: Jul 3, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

Visual mental imagery and visual perception: structural equivalence revealed by scanning processes.

Gregoire Borst¹, Stephen M Kosslyn

¹Department of Psychology, Harvard University, Cambridge, Massachusetts 02138, USA. borst@wjh.harvard.edu

Memory & Cognition

|July 9, 2008

Summary

Visual mental imagery and visual perception share similar information representation and processing, suggesting common underlying mechanisms. This research compares scanning speeds in mental images versus perception.

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Area of Science:

Cognitive Psychology
Neuroscience
Visual Cognition

Background:

Understanding how the brain represents and processes visual information is crucial.
Distinguishing between visual perception and mental imagery aids in understanding cognitive functions.

Purpose of the Study:

To investigate if visual mental imagery and early visual perception utilize similar information representations.
To compare the processing of visual information in mental imagery versus perceptual tasks.

Main Methods:

Participants scanned over dot patterns in mental images (from recent or long-term memory) and during visual perception.
Scanning times over increasing distances were measured for each task.

Main Results:

Scanning times increased comparably with distance in Experiment 1 (recent memory).
In Experiment 2 (long-term memory), mental imagery scanning was slower, but rates correlated with perceptual scanning.
High correlations between perceptual and imagery scanning rates were observed in both experiments.

Conclusions:

Visual mental imagery and perception share similar representational formats.
The brain processes information similarly across both visual perception and mental imagery tasks.