Related Experiment Video
Updated: May 9, 2026
09:49
Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
Published on: April 16, 2014
Illusory contours: a window onto the neurophysiology of constructing perception
Micah M Murray1, Christoph S Herrmann
1The Functional Electrical Neuroimaging Laboratory, Neuropsychology and Neurorehabilitation Service, Department of Clinical Neurosciences, Centre Hospitalier Universitaire Vaudois and University of Lausanne, 1011 Lausanne, Switzerland. micah.murray@chuv.ch
Trends in Cognitive Sciences
|August 10, 2013
Summary
Seeing is an active brain process, not passive reception. Visual completion, like illusory contours, highlights how the brain constructs perception by integrating neural information across populations, emphasizing spatiotemporal dynamics.
Area of Science:
- Neuroscience
- Cognitive Science
- Visual Perception
Background:
- Seeing appears effortless but requires complex segregation and integration of visual information.
- Phenomena like illusory contours challenge passive visual recapitulation, suggesting active visual completion.
- Current models of visual processing stem from diverse electrophysiology, neuroimaging, and neurostimulation studies.
Purpose of the Study:
- To reconcile discrepant findings regarding the neural instantiation of visual completion and seeing.
- To emphasize the role of spatiotemporal brain dynamics in perception models.
Main Methods:
- Review and synthesis of findings from single-unit and population-level electrophysiology.
- Integration of data from neuroimaging and neurostimulation studies.
- Analysis of spatiotemporal brain dynamics in visual processing.
Main Results:
- Discrepant findings from different methodologies can be reconciled by considering spatiotemporal dynamics.
- Visual completion is an active process involving information exchange across neural populations.
- Models of brain function and perception must incorporate dynamic neural activity patterns.
Conclusions:
- Seeing and visual completion are active, dynamic processes.
- Reconciling diverse research findings requires a focus on spatiotemporal brain dynamics.
- Future models of perception should prioritize neural information exchange and dynamic activity across populations.
Related Concept Videos
01:21Gestalt 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...
01:12Perceptual 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...
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...
01:28Perception
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...
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...
01:15Subliminal 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...
01:20Parallel 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...
01:11Sensory Perception: Organization of the Somatosensory System
The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...