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Related Concept Videos

Auditory Perception01:17

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...
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Subliminal Perception01:15

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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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Factors Affecting Perception01:25

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Perception01:28

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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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The Auditory Ossicles01:11

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
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Functional brain changes in auditory phantom perception evoked by different stimulus frequencies.

Jeffrey Hullfish1, Ian Abenes1, Silvia Kovacs2

  • 1School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX 75080, USA.

Neuroscience Letters
|August 4, 2018
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Summary

This study explored how Bayesian brain models explain tinnitus. Functional MRI data from chronic tinnitus patients revealed distinct brain activity patterns for tinnitus-frequency versus control-frequency sounds, supporting predictive coding theories.

Keywords:
ConnectivityDistressPrediction errorSalienceTinnitusfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Neuroscience

Background:

  • Bayesian brain models, including active inference and predictive coding, provide a theoretical basis for understanding brain function.
  • Auditory phantom perception, such as tinnitus, represents a complex neurological disorder potentially explained by these models.

Purpose of the Study:

  • To empirically investigate the application of Bayesian brain models to the pathology of chronic tinnitus.
  • To analyze brain activity and functional connectivity in response to auditory stimuli matched to tinnitus frequency versus control frequency.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was conducted on 75 individuals with chronic tinnitus.
  • A within-subject design presented auditory stimuli at the participants' tinnitus frequency (TF) and a control frequency (CF).
  • Analysis focused on brain activity and functional connectivity differences between TF and CF conditions.

Main Results:

  • Tinnitus-frequency (TF) stimuli showed increased activity and functional connectivity in brain regions associated with tinnitus-related distress.
  • Control-frequency (CF) stimuli elicited greater activity and connectivity in areas linked to auditory perception and attention.

Conclusions:

  • Results support the Bayesian brain framework, suggesting altered predictive processing in tinnitus.
  • Findings highlight the role of cognitive and emotional processing in tinnitus pathology and offer directions for future research.