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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...
Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
Hearing01:31

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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Related Experiment Video

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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

How attention extracts objects from noise.

Michael S Pratte1, Sam Ling, Jascha D Swisher

  • 1Psychology Department and Vanderbilt Vision Research Center, Vanderbilt University, Nashville, Tennessee.

Journal of Neurophysiology
|June 28, 2013
PubMed
Summary
This summary is machine-generated.

Attention acts as a noise filter in early visual processing and amplifies signals in higher visual areas. This dual mechanism enhances object recognition in noisy environments by improving visual information processing.

Keywords:
decodingequivalent noisefunctional magnetic resonance imagingnoise reductionprimary visual cortexselective attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The visual system effectively processes information in cluttered environments, but the role of attention in filtering visual noise is not fully understood.
  • Attention is known to enhance sensory processing, yet its precise mechanisms for extracting relevant information from noise remain unclear.
  • The perceptual template model proposes attention may amplify all visual input or filter out irrelevant noise.

Purpose of the Study:

  • To investigate how attention modulates cortical responses to objects at different levels of the visual pathway using fMRI.
  • To differentiate between noise-filtering and amplification mechanisms of attention in visual processing.
  • To determine the locus of attentional effects within the visual hierarchy.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to study brain activity.
  • Multivoxel pattern analysis (MVPA) was used to decode object categories from brain activity patterns.
  • Participants viewed images of various objects (faces, houses, chairs, shoes) under different levels of visual noise while attending or not attending to stimuli.

Main Results:

  • Early visual areas (V1, V2) showed attentional benefits only with high levels of visual noise, indicating a noise-filtering role.
  • Higher visual areas (V4, fusiform face area, mid-Fusiform area, lateral occipital cortex) demonstrated attentional amplification of noise-free stimuli.
  • Attention improved object discrimination by de-noising early visual input and amplifying the processed signal in later stages.

Conclusions:

  • Attention employs distinct mechanisms across the visual hierarchy to enhance object recognition.
  • A noise-filtering mechanism in early visual areas complements an amplification mechanism in higher areas.
  • These findings elucidate the neural basis of how attention navigates visual noise for effective object perception.