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Results for “Auditory Perception”

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At least 127 records · Page 7Linked to original sources
PubMed2000

Frontal processing and auditory perception.

Disordered processing of the pattern in sound over time has been observed in a number of clinical disorders, including developmental dyslexia. This study addresses the brain mechanisms required for the perception of such a pattern. We report the systematic evaluation of temporal perception in a patient with a single intact right auditory cortex and a large right frontal lobe lesion. A striking dissociated deficit was demonstrated in the perception of temporal pattern at the level of tens or hundreds of milliseconds. This proves that, contrary to common belief, mechanisms in the pathway up to and including the primary auditory cortex are not sufficient for the normal perception of temporal pattern. This work suggests a need for frontal processing for the normal perception of auditory pattern.

Adult↗
PubMed1999

Dissociation of fMRI activation and awareness in auditory perception task.

To investigate the relationship between activity in sensory cortex, and the experience of sensory stimuli, functional magnetic resonance imaging (fMRI) of temporal cortex was performed while subjects indicated their perception of speech sounds combined with noise. Auditory cortex activation was found to decrease with decreasing stimulus saliency. Speech stimuli presented at an intensity level near auditory threshold produced significant activation in temporal cortex even when subjects did not report perception of stimuli. These dissociations between simultaneously recorded neurophysiological and psychophysical measures suggest that stimulus-evoked cortical activity does not necessarily produce conscious perception.

Acoustic Stimulation↗
PubMed1979

Absolute and relative cues for the auditory perception of egocentric distance.

Three experiments were performed to examine the reverberation cue to egocentric auditory distance and to determine the extent to which such a cue could provide 'absolute', as contrasted with 'relative', information about distance. In experiment 1 independent groups of blindfolded observers (200 altogether) were presented with broadband noise from a speaker at one of five different distances (0.55 to 8 m) in a normal hard-walled room. Half of each group of observers were presented with the sound at 0 deg azimuth, followed (after a delay) by the identical sound at 90 deg azimuth. The order of presentation was reversed for the remaining observers. Perceived distance varied significantly as a function of the physical distance to the speaker, even for the first presentations. The change in the binaural information between the 0 deg and 90 deg presentations did not significantly modify the results. For both orientations, near distances were overestimated and far distances were underestimated. Experiment 2 and 3 were designed to evaluate how much prior auditory exposure to the laboratory environment was necessary. A 200 Hz square-wave signal was presented from one of three distances (1, 2, or 6 m) to observers who had either minimal room information or an exposure which included talking within the room. Perceived distance varied significantly with physical distance regardless to exposure condition.

Acoustic Stimulation↗