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Related Concept Videos

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...
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...
Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
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...
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...
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.

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Related Experiment Video

Updated: May 7, 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

Frontoparietal cortex mediates perceptual transitions in bistable perception.

Veith A Weilnhammer1, Karin Ludwig, Guido Hesselmann

  • 1Visual Perception Laboratory, Department of Psychiatry and Psychotherapy, Charité Universitätsmedizin, 10117 Berlin, Germany, and Department of Psychology, Humboldt-Universität zu Berlin, 10099 Berlin, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 4, 2013
PubMed
Summary

Brain activity in the frontoparietal cortex is crucial for perceptual transitions during bistable vision. This study confirms enhanced frontoparietal activity, demonstrating top-down modulation of visual processing.

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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
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Last Updated: May 7, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
09:25

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Published on: July 26, 2019

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Bistable vision involves alternating perceptions with constant sensory input.
  • Previous studies show greater frontoparietal cortex activity during endogenous perceptual transitions.
  • The role of this enhanced activity (causal influence vs. stimulus differences) remains debated.

Purpose of the Study:

  • To investigate the neural mechanisms underlying perceptual transitions in bistable vision.
  • To determine if enhanced frontoparietal activity causally influences sensory processing.
  • To differentiate between endogenous and externally controlled perceptual transitions.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) experiment with 15 participants.
  • Utilized a rotating Lissajous figure to induce bistable perception.
  • Employed dynamic causal modeling (DCM) to analyze effective connectivity.

Main Results:

  • Confirmed greater frontoparietal cortex activity for transitions in bistable perception compared to replay conditions.
  • Controlled for potential confounds such as transition duration.
  • DCM analysis revealed modulation of top-down connectivity from frontal to visual cortex.

Conclusions:

  • Enhanced frontoparietal activity is linked to top-down modulation of visual processing.
  • These findings support a causal role for frontoparietal cortex in perceptual transitions during bistable vision.