What is extinguished in auditory extinction?
Extinction is a frequent sequel of brain damage, whereupon patients disregard (extinguish) a contralesional stimulus, and report only the more ipsilesional stimulus, of a pair of stimuli presented simultaneously. We investigated the possibility of a dissociation between the detection and the identification of extinguished phonemes. Fourteen right hemisphere damaged patients with severe auditory extinction were examined using a paradigm that separated the localization of stimuli and the identification of their phonetic content. Patients reported the identity of left-sided phonemes, while extinguishing them at the same time, in the traditional sense of the term. This dissociation suggests that auditory extinction is more about acknowledging the existence of a stimulus in the contralesional hemispace than about the actual processing of the stimulus.
Deouell
L Y
LY
Department of Psychology, The Hebrew University of Jerusalem, Israel. msleon@tms.huji.ac.il
Soroker
N
N
D000161:Acoustic Stimulation; D000328:Adult; D000368:Aged; D001288:Attention / Q000502:physiology; D001308:Auditory Perceptual Disorders / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D001930:Brain Injuries / Q000150:complications* / Q000473:pathology / Q000503:physiopathology; D002540:Cerebral Cortex / Q000293:injuries* / Q000473:pathology / Q000503:physiopathology; D005108:Extinction, Psychological / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007807:Language Tests / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D009949:Orientation / Q000502:physiology*; D010468:Perceptual Disorders / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D011597:Psychomotor Performance / Q000502:physiology; D013017:Sound Localization / Q000502:physiology; D013067:Speech Perception / Q000502:physiology; D020521:Stroke / Q000150:complications / Q000473:pathology / Q000503:physiopathology