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Auditory Pathway

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...

Hearing

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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.

Auditory Perception

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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...

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...

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Related Experiment Video

Updated: Jun 6, 2026

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Published on: July 5, 2015

Endogenous auditory spatial attention modulates obligatory sensory activity in auditory cortex.

Alan J Power¹, Edmund C Lalor, Richard B Reilly

¹Trinity Centre for Bioengineering, Trinity College Dublin, Dublin 2, Ireland.

Cerebral Cortex (New York, N.Y. : 1991)

|November 12, 2010

Summary

Endogenous attention, the brain's self-directed focus, modulates obligatory sensory processing in the auditory cortex. This study used auditory evoked spread spectrum analysis (AESPA) to reveal these attention-related modulations.

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Area of Science:

Neuroscience
Auditory Neuroscience
Cognitive Neuroscience

Background:

Endogenous attention involves self-directed focus.
Debate exists on whether attention enhances sensory processing or involves separate neural activity.
Exogenous attention can interfere with endogenous attention studies.

Purpose of the Study:

To assess the effects of endogenous attention on auditory processing.
To investigate if attention enhances obligatory sensory activity.
To utilize the novel auditory evoked spread spectrum analysis (AESPA) method for detailed temporal analysis.

Main Methods:

Auditory evoked spread spectrum analysis (AESPA) was employed.
Continuous and competing auditory stimuli were used.
The AESPA method captures activity related to the stimulus envelope, minimizing exogenous attention effects.

Main Results:

Attentional modulations were observed around 136 ms, corresponding to the Nc component in AESPA.
These modulations were localized to the auditory cortex.
Findings indicate a direct modulation of obligatory sensory activity by endogenous attention.

Conclusions:

Endogenous attention directly modulates obligatory sensory activity in the auditory cortex.
While non-sensory attention centers may be involved, sensory modulation is clearly demonstrated.
The study provides evidence for sensory enhancement as a mechanism of endogenous attention.