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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Motor and Sensory Areas of the Cortex01:14

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.
Spinal Cord: Information Processing01:10

Spinal Cord: Information Processing

The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
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...
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...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Related Experiment Video

Updated: May 8, 2026

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

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Across-speaker articulatory reconstruction from sensorimotor cortex for generalizable brain-computer interfaces.

Ruoling Wu1, Julia Berezutskaya1, Zachary V Freudenburg1

  • 1University Medical Center Utrecht Brain Center, Utrecht, The Netherlands.

Journal of Neural Engineering
|March 3, 2026
PubMed
Summary
This summary is machine-generated.

This study demonstrates that generalizable articulatory features can be extracted from brain activity using tensor component analysis (TCA). This approach successfully reconstructs speech features from high-density electrocorticography (HD-ECoG) signals, offering new possibilities for speech brain-computer interfaces (BCIs).

Keywords:
articulatory kinematicshigh-density electrocorticographysensorimotor cortexspeech brain–computer interfacespeech reconstruction

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Speech Science

Background:

  • Speech brain-computer interfaces (BCIs) aim to restore speech by decoding brain activity.
  • Individuals with vocal tract paralysis face challenges in speech BCI development due to the absence of articulatory movements.
  • Extracting generalizable articulatory features is crucial for robust speech BCI performance.

Purpose of the Study:

  • To extract generalizable articulatory features from a dataset of native Dutch speakers.
  • To reconstruct these articulatory features from the brain activity of able-bodied individuals using high-density electrocorticography (HD-ECoG).
  • To evaluate the feasibility of using generalizable features for speech BCI development in individuals with paralysis.

Main Methods:

  • Tensor Component Analysis (TCA) was employed to identify generalizable articulatory features from movement data.
  • HD-ECoG data from three participants were analyzed to extract neural features.
  • A gradient boosting regression model predicted articulatory features from neural features.
  • Reconstruction performance was quantified using Pearson's correlation coefficient (PCC).

Main Results:

  • Extracted articulatory features demonstrated consistent contributions across participants, indicating generalizability.
  • Articulatory features were successfully reconstructed from HD-ECoG data.
  • Mean PCC values of 0.80, 0.75, and 0.76 were achieved for the three participants, significantly above chance.

Conclusions:

  • Speech-related articulatory features can be restored from HD-ECoG signals using generalizable features.
  • This framework shows promise for developing speech BCIs for individuals unable to produce mouth movements.
  • The reconstructed articulatory features may enable the generation of audio or speech-related facial movements.