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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...
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...
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...
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...
Subliminal Perception01:15

Subliminal Perception

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...
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...

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Cross-Modal Multivariate Pattern Analysis
13:51

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Multistable perception: when bottom-up and top-down coincide.

Jürgen Kornmeier1, Christine Maira Hein, Michael Bach

  • 1Univ.-Augenklinik, Killianstrasse 5, 79106 Freiburg, Germany. juergen.kornmeier@uni-freiburg.de

Brain and Cognition
|August 7, 2008
PubMed
Summary
This summary is machine-generated.

Perceptual reversals in ambiguous figures can be controlled volitionally and are influenced by stimulus presentation. These top-down and bottom-up mechanisms interact additively, suggesting distinct neural origins.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychology

Background:

  • Ambiguous figures undergo spontaneous perceptual reversals during prolonged viewing.
  • The underlying mechanisms of these reversals are debated, with theories focusing on bottom-up and top-down processes.

Purpose of the Study:

  • To investigate the interplay between volitional control (top-down) and discontinuous stimulus presentation (bottom-up) on perceptual reversal rates.
  • To determine if these factors interact additively or in other ways.

Main Methods:

  • Participants observed ambiguous figures under conditions of volitional control and discontinuous stimulus presentation.
  • The rate and stability of perceptual reversals were measured under various experimental manipulations.

Main Results:

  • Participants successfully employed volitional strategies to modulate the duration of perceptual stability.
  • The effects of volitional control and discontinuous stimulus presentation were found to be fully additive.
  • This suggests independent contributions of top-down and bottom-up mechanisms.

Conclusions:

  • Perceptual reversals are not solely driven by one type of mechanism but can arise from distinct neural processes operating on different timescales.
  • Both volitional control and stimulus presentation methods offer insights into the flexible nature of visual perception.