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Related Concept Videos

Vision01:24

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.
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Visual System01:26

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 Vision01:15

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.

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Related Experiment Video

Updated: Jun 6, 2026

Calcium Imaging in Mouse Superior Colliculus
10:43

Calcium Imaging in Mouse Superior Colliculus

Published on: April 21, 2023

Visual field position shapes input sampling and output routing in the superior colliculus.

Alex Calzoni1,2, Arnau Sans-Dublanc1,2,3, Norma K Kuhn1,2

  • 1VIB - KU Leuven Center of Neuroscience, Leuven, Belgium.

Biorxiv : the Preprint Server for Biology
|June 5, 2026
PubMed
Summary

The mouse superior colliculus exhibits specialized circuits for processing upper and lower visual fields. These visual-field-dependent modules bias how the brain samples visual input and directs signals for action.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Circuitry

Background:

  • The superior colliculus in mice is crucial for transforming visual stimuli into behavioral responses.
  • Its superficial layers receive organized retinal input and contain distinct neuron types projecting to various brain regions.
  • Understanding if these circuits are uniform across visual space or specialized is key.

Purpose of the Study:

  • To investigate whether the mouse superficial superior colliculus contains visual-field-dependent circuit specializations.
  • To determine how different visual field domains (upper vs. lower) sample inputs and project to downstream targets.

Main Methods:

  • Dual-color rabies tracing to map neural inputs to wide-field and narrow-field neurons.
  • MAPseq to trace projections of superficial collicular neurons.
  • Two-photon calcium imaging to assess stimulus selectivity of neurons in different visual field domains.

Main Results:

  • While both upper and lower visual field domains receive input from shared brain regions, they differ in input sampling.
  • Specific source regions preferentially innervate either the upper or lower visual field, or contain segregated projecting neurons.
  • Neuron projection targets and stimulus selectivity differ between upper and lower visual field populations.

Conclusions:

  • The mouse superficial superior colliculus is organized into visual-field-dependent circuit modules.
  • This specialized wiring logic influences how visual information is processed and relayed to downstream pathways.
  • Findings reveal a fundamental principle of visual-field specialization in sensory processing.