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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...
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...
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...
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...
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...
Sensation01:21

Sensation

Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
Absolute thresholds can quantify the sensitivity of sensory...

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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
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Published on: July 26, 2019

Object perception: when our brain is impressed but we do not notice it.

Jürgen Kornmeier1, Michael Bach

  • 1Universitäts-Augenklinik, Freiburg, Germany. juergen.kornmeier@uni-freiburg.de

Journal of Vision
|March 11, 2009
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Summary

Perception of ambiguous figures becomes stable with slight changes, altering event-related potential (ERP) brain responses around 400 ms. This finding supports Bayesian models of perceptual decision-making.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Human perception typically creates stable world representations despite ambiguous sensory input.
  • Ambiguous figures, unlike stable ones, lead to unstable perception that alternates between interpretations.

Purpose of the Study:

  • To compare electroencephalography (EEG) responses to ambiguous and unambiguous visual stimuli.
  • To investigate the neural correlates of perceptual stability and decision-making.

Main Methods:

  • EEG recordings were used to measure brain activity.
  • Participants viewed ambiguous figures (Necker cube, Old/Young Woman) and their unambiguous variants.

Main Results:

  • A significant difference in an event-related potential (ERP) component around 400 ms was observed.
  • This ERP difference occurred when ambiguous figures were modified into unambiguous ones.
  • The findings were consistent across both geometric and semantic stimuli.

Conclusions:

  • Late EEG signatures, specifically ERPs around 400 ms, may reflect the outcome of perceptual interpretation.
  • Results align with Bayesian inference models, suggesting perception evaluates interpretation reliability for action planning.
  • This perceptual evaluation process appears to be unconscious.