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Related Concept Videos

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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
Synesthesia01:27

Synesthesia

Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
Positive Symptoms Schizophrenia: Hallucinations and Delusions01:26

Positive Symptoms Schizophrenia: Hallucinations and Delusions

Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
Hallucinations
Hallucinations in...
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
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Theta-gamma dysrhythmia and auditory phantom perception.

Dirk De Ridder1, Elsa van der Loo, Sven Vanneste

  • 1Brai2n, Tinnitus Research Initiative Clinic, and Department of Neurosurgery, University Hospital Antwerp, Belgium. dirk.de.ridder@uza.be

Journal of Neurosurgery
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Tinnitus, an auditory phantom percept, may stem from thalamocortical dysrhythmia. This study shows auditory cortex stimulation normalizing abnormal brain oscillations, suggesting a causal link to tinnitus perception.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neuromodulation

Background:

  • Tinnitus is an auditory phantom percept, potentially linked to thalamocortical dysrhythmia.
  • Thalamocortical dysrhythmia involves pathological theta-gamma coupling in brain regions normally showing alpha oscillations.

Observation:

  • Auditory cortex stimulation was applied to a tinnitus patient targeting a functional MR imaging activation hotspot.
  • Intracranial recordings were analyzed during stimulation to assess spectral changes.

Findings:

  • Maximal tinnitus suppression occurred with stimulation at the activation hotspot, correlating with increased gamma and theta activity.
  • Normal alpha peaks were observed at other electrode poles.
  • Spectral changes normalized during tinnitus suppression, observed in both intracranial and EEG recordings.

Implications:

  • These findings support the thalamocortical dysrhythmia model of tinnitus.
  • The study suggests a causal relationship between theta-gamma coupling and the conscious perception of auditory phantom percepts.
  • This provides a potential therapeutic target for tinnitus treatment through neuromodulation.