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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...
Concepts and Prototypes01:24

Concepts and Prototypes

The human nervous system handles vast amounts of information by translating sensory stimuli into neural impulses, which the brain processes, creating thoughts expressed through language or stored as memories. The brain also synthesizes information from emotions and memories, which significantly influence thoughts and behaviors. This intricate process creates a comprehensive mental picture.
The brain organizes this information using concepts, which are mental categories grouping linguistic data,...
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...
Factors Affecting Perception01:25

Factors Affecting Perception

Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
Sensory Perception: Organization of the Somatosensory System01:11

Sensory 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...

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Related Experiment Video

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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
14:38

Creating Objects and Object Categories for Studying Perception and Perceptual Learning

Published on: November 2, 2012

Conceptual representations of perceptual knowledge.

Edward E Smith1, Nicholas Myers, Umrao Sethi

  • 1Department of Psychology, Columbia University, 1190 Amsterdam Ave., New York, NY, 10027, USA. eesmith@psych.columbia.edu

Cognitive Neuropsychology
|September 22, 2012
PubMed
Summary
This summary is machine-generated.

Neuroimaging studies suggest perceptual knowledge is modality-specific. However, this study found evidence for amodal representations in semantic memory, particularly in the left inferior frontal gyrus (IFG).

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Previous neuroimaging research on semantic memory often posits modality-specific representations for object properties.
  • This view is supported by findings of activation in the left fusiform gyrus during object-property verification tasks.

Purpose of the Study:

  • To investigate the representation of perceptual knowledge in semantic memory.
  • To extend previous findings by examining both modality-specific and amodal components.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan participants.
  • Participants verified object-property statements (e.g., "cat-whiskers?").
  • Behavioral performance measures were collected.

Main Results:

  • Replicated previous findings of activation in the left fusiform gyrus.
  • Identified additional activation in amodal regions: left inferior frontal gyrus (IFG) and middle-temporal gyrus.
  • Correlations between behavioral performance and activation were significant only in the left IFG.

Conclusions:

  • Evidence supports an amodal component in the representation and processing of perceptual knowledge.
  • The left IFG appears to play a crucial role in amodal processing of perceptual information.
  • Findings challenge purely modality-specific accounts of semantic memory for object properties.