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Related Concept Videos

Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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...
Sensory Modalities01:15

Sensory Modalities

Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...
Sensory Memory01:14

Sensory Memory

Sensory memory captures information from the environment in its original form for a very brief duration, just long enough to be exposed to visual, auditory, and other senses. This type of memory is detailed and rich but quickly lost unless certain strategies are employed to transfer it into short-term or long-term memory. Sensory information is continuously bombarding the human brain, yet only a small fraction is absorbed, as most of it does not significantly impact daily life. For instance,...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.

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Related Experiment Video

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A Two-interval Forced-choice Task for Multisensory Comparisons
07:13

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

Multisensory numerosity judgments for visual and tactile stimuli.

Alberto Gallace1, Hong Z Tan, Charles Spence

  • 1Department of Experimental Psychology, Oxford University, Oxford, England. alberto.gallace@psy.ox.ac.uk

Perception & Psychophysics
|August 31, 2007
PubMed
Summary

Numerosity judgments, or counting, may rely on a single system for all senses, not separate ones. This study found counting visual and tactile stimuli together was less accurate than expected, suggesting a unified cognitive process.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Integration

Background:

  • Numerosity judgments have primarily been studied using single sensory inputs (unimodal).
  • It remains unclear if limitations in unimodal counting apply to multisensory environments.
  • Investigating cross-modal numerosity is crucial for understanding cognitive resource allocation.

Purpose of the Study:

  • To examine numerosity judgments under both unimodal and bimodal stimulus presentations.
  • To determine if counting stimuli across different sensory modalities (visual and tactile) relies on shared or separate cognitive resources.
  • To test whether divided attention explains performance differences in bimodal counting.

Main Methods:

  • Participants counted vibrotactile and visual stimuli presented individually (unimodal) and simultaneously (bimodal).
  • Stimuli ranged from one to six items in each modality.
  • A second experiment specifically assessed the impact of divided attention on bimodal numerosity.

Main Results:

  • Bimodal numerosity judgments were less accurate than predicted by models assuming independent sensory resources.
  • Performance deficits in bimodal conditions were not attributable to divided attention costs.
  • Findings suggest that numerosity processing may involve a unitary, amodal system.

Conclusions:

  • Numerosity judgments appear to engage a common, cross-modal system rather than independent modality-specific ones.
  • This challenges existing theories of modality-specific resource limitations in counting.
  • Results support the existence of higher-order cognitive mechanisms or spatial representations shared across senses for numerosity tasks.