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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
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.
What is a Sensory System?01:31

What is a Sensory System?

Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jun 14, 2026

Cross-Modal Multivariate Pattern Analysis
13:51

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Modality-dependent "what" and "where" preparatory processes in auditory and visual systems.

Andreea Oliviana Diaconescu1, Claude Alain, Anthony Randal McIntosh

  • 1Rotman Research Institute, Baycrest Centre, Toronto, Ontario, Canada. adiaconescu@rotman-baycrest.on.ca

Journal of Cognitive Neuroscience
|March 31, 2010
PubMed
Summary

This study reveals distinct brain processes for identifying object features versus locating them. Preparatory brain activity for "where" information is shared across senses, while "what" information processing is specific to the sensory modality.

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Area of Science:

  • Cognitive Neuroscience
  • Sensory Processing
  • Human Brain Imaging

Background:

  • Understanding how the brain prepares for upcoming sensory information is crucial for explaining perception and attention.
  • The
  • what
  • (object recognition) and
  • where
  • (spatial localization) pathways are fundamental to sensory processing.

Purpose of the Study:

  • To investigate the modality specificity and spatio-temporal dynamics of
  • what
  • and
  • where
  • preparatory processes.
  • To differentiate brain activity related to preparing for auditory versus visual targets.
  • To explore how cues signaling identity or location influence preparatory brain states.

Main Methods:

  • Utilized electroencephalography (ERGs) and a cue-target paradigm with auditory and visual stimuli.
  • Employed multivariate spatio-temporal partial least square (ST-PLS) analysis to examine brain activity patterns.
  • Conducted two experiments, one with auditory cues and another with visual cues, to assess modality effects.

Main Results:

  • Faster reaction times were observed for location-based responses compared to identity-based responses.
  • Supramodal
  • where
  • preparatory processes were identified in central and posterior parietal regions for both auditory and visual targets.
  • Modality-specific preparation was found for pitch (auditory) and shape (visual) processing at distinct temporal and occipital sites.

Conclusions:

  • The brain exhibits a division of labor between sensory pathways for processing identity and location information.
  • Preparatory processes for spatial localization (
  • where
  • ) are largely supramodal, while those for object features (
  • what
  • ) are modality-specific.
  • These findings provide insights into the neural mechanisms underlying anticipatory attention and sensory integration.