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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...

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

Perception

Perception

Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...

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...

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

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...

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Related Experiment Video

Updated: Aug 14, 2025

Exploring Infant Sensitivity to Visual Language using Eye Tracking and the Preferential Looking Paradigm

Exploring Infant Sensitivity to Visual Language using Eye Tracking and the Preferential Looking Paradigm

Published on: May 15, 2019

Seeing is great, understanding is better.

H Holden Thorp¹, Michael B Yaffe²

¹H. Holden Thorp is the Editor-in-Chief, Science journals, American Association for the Advancement of Science, Washington, DC 20005, USA.

Science Signaling

|January 10, 2023

Summary

Science Signaling celebrates its anniversary by highlighting the crucial role of fundamental research in advancing scientific discovery. Basic science is essential for future breakthroughs and innovation.

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Last Updated: Aug 14, 2025

Exploring Infant Sensitivity to Visual Language using Eye Tracking and the Preferential Looking Paradigm

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Area of Science:

Cellular Biology
Biochemistry
Physiology

Background:

Science's STKE, a key resource for cell signaling, was renamed Science Signaling in January 2008.
The journal began publishing primary research papers later in 2008, expanding its scope.
This reflection marks the anniversary of the journal's transition and its focus on signaling pathways.

Discussion:

The authors emphasize that foundational, curiosity-driven research is indispensable for scientific progress.
They argue that basic science fuels innovation and leads to unexpected discoveries.
The importance of sustained investment in fundamental research is underscored.

Key Insights:

Basic research is the bedrock upon which applied science and technological advancements are built.
Understanding fundamental mechanisms is critical for addressing complex biological questions.
The long-term impact of basic research often surpasses initial expectations.

Outlook:

Continued exploration of fundamental biological processes will drive future therapeutic and technological innovations.
The journal Science Signaling remains dedicated to publishing high-impact basic research.
Sustained support for basic science is vital for the future of scientific discovery and societal benefit.