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Related Concept Videos

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...
Gestalt Principles of Perception01:21

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...
Factors Affecting Perception01:25

Factors Affecting Perception

Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
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...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

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Related Experiment Video

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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

New insights into action-perception coupling.

Anatol G Feldman1

  • 1Department of Physiology, Center for Interdisciplinary Research in Rehabilitation, University of Montreal, Montreal, Canada. feldman@med.umontreal.ca

Experimental Brain Research
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

The brain uses a common spatial frame of reference for action and perception, challenging the century-old efference copy theory. This new model explains movement, limb position sense, and visual stability.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Perception

Background:

  • The dominant efference copy (EC) theory posits the brain uses command copies to adjust motor action and perception.
  • EC theory faces challenges in explaining posture-movement, kinesthesia, and visual constancy.
  • Classical problems in action and perception remain inadequately addressed by current models.

Purpose of the Study:

  • To propose a novel framework for understanding action and perception.
  • To offer a physiologically feasible explanation for classical problems in motor control and sensory processing.
  • To challenge the long-standing efference copy theory.

Main Methods:

  • Utilized an advanced formulation of the equilibrium-point hypothesis.
  • Proposed a common spatial frame of reference for action and perception.
  • Analyzed experimental data on frame of reference modification and feedforward control.

Main Results:

  • The equilibrium-point hypothesis provides solutions to posture-movement, kinesthesia, and visual constancy.
  • The brain selects and modifies spatial frames of reference (origin, metrics, orientation) to influence action and perception.
  • Feedforward modification of frames enables anticipatory and predictive brain function.

Conclusions:

  • The proposed framework offers a more comprehensive explanation for action and perception than EC theory.
  • This approach extends to phenomena like sense of effort, kinesthetic illusions, and phantom limb.
  • The brain's use of physical frames of reference explains the perception of external reality.