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Related Concept Videos

Perception01:28

Perception

1.8K
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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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Factors Affecting Perception01:25

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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...
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Subliminal Perception01:15

Subliminal Perception

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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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Gestalt Principles of Perception01:21

Gestalt Principles of Perception

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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: May 3, 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

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Perception: a motion after-effect for voluntary actions.

Flavia Mancini1, Patrick Haggard2

  • 1Department of Neuroscience, Physiology and Pharmacology, University College London, London, UK; Institute of Cognitive Neuroscience, University College London, London, UK.

Current Biology : CB
|January 25, 2014
PubMed
Summary
This summary is machine-generated.

Experiencing a motion after-effect, where stationary objects appear to move oppositely after viewing directional motion, is common. A new study reveals a novel motion after-effect specifically linked to hand movements.

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Area of Science:

  • Neuroscience
  • Perception science
  • Human sensory systems

Background:

  • The motion after-effect (MAE) is a perceptual illusion where prolonged exposure to directional motion causes stationary objects to appear to move in the opposite direction.
  • This phenomenon is well-documented and studied in the context of visual perception and neural adaptation.

Purpose of the Study:

  • To investigate a novel form of motion after-effect.
  • To determine if hand movement influences the experience of motion after-effects.

Main Methods:

  • Participants viewed directional motion stimuli.
  • Subsequent perception of stationary objects was assessed.
  • The role of concurrent or preceding hand movements was manipulated and analyzed.

Main Results:

  • A novel motion after-effect was identified.
  • This newly discovered after-effect was found to be dependent on the movement of the participant's hand.
  • The results suggest a unique interaction between motor activity and visual motion perception.

Conclusions:

  • Hand movement can induce or modulate specific motion after-effects.
  • This finding expands our understanding of the complex interplay between motor and sensory systems in the brain.
  • Further research may explore the neural mechanisms underlying this hand-movement-dependent motion after-effect.