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Related Concept Videos

Parallel Processing01:20

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 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...
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.
Subconsciousness and No Awareness01:15

Subconsciousness and No Awareness

The concept of subconscious awareness refers to the processing of information below the level of conscious thought, which significantly influences both behaviors and decisions. It is also known as waking subconscious awareness. This complex level of cognition operates without the direct awareness of the individual, facilitating rapid and simultaneous handling of multiple information streams.
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
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.
Perception01:28

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...

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Related Experiment Video

Updated: May 23, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Is visual processing in the dorsal stream accessible to consciousness?

A D Milner1

  • 1Department of Psychology, Durham University, Durham, UK. a.d.milner@durham.ac.uk

Proceedings. Biological Sciences
|March 30, 2012
PubMed
Summary
This summary is machine-generated.

The dorsal stream guides movement using visual information without conscious awareness, while the ventral stream handles object recognition and memory. These two visual processing pathways in the primate brain have distinct, yet interconnected, roles.

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Related Experiment Videos

Last Updated: May 23, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention

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Area of Science:

  • Neuroscience
  • Primate Visual Cortex

Background:

  • The primate cortex contains two main visual processing clusters: the dorsal and ventral streams.
  • The dorsal stream connects primary visual cortex (V1) to the occipito-parietal cortex.
  • The ventral stream connects V1 to the occipito-temporal cortex.

Purpose of the Study:

  • To investigate the functional roles of the dorsal and ventral visual streams.
  • To provide empirical evidence for the dorsal stream's role in visually guided movement without awareness.

Main Methods:

  • Review of existing literature on non-human primates and human neurological patients.
  • Support from recent functional magnetic resonance imaging (fMRI) studies in humans.

Main Results:

  • The dorsal stream primarily provides real-time visual guidance for online movement.
  • The ventral stream, with top-down memory input, supports offline recognition, thought, planning, and memory.
  • Evidence supports the dorsal stream's control of movement independent of visual awareness.

Conclusions:

  • The dorsal stream governs the visual control of movement without conscious visual awareness.
  • The ventral stream is crucial for recognition and memory-related visual processing.
  • These two streams represent distinct, interconnected systems within primate visual processing.