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Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control
Published on: July 5, 2015
The attenuation of auditory neglect by implicit cues.
A Rand Coleman1, J Michael Williams
1Department of Psychology, Drexel University, 15th & Race Street, Philadelphia, PA 19102, USA.
Semantic cues significantly reduced auditory neglect in patients with right hemisphere lesions. However, rhyming cues worsened neglect, indicating content-specific processing of auditory information.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Auditory Perception
Background:
- Auditory neglect, often resulting from right cerebral hemisphere lesions, impairs the perception of sounds, particularly those presented to the left ear.
- Despite intact language centers, patients with auditory neglect struggle with processing auditory stimuli.
- The role of semantic and phonological processing in modulating auditory neglect is not fully understood.
Purpose of the Study:
- To investigate the impact of implicit semantic and rhyming cues on auditory perception in nonaphasic patients with right hemisphere lesions and auditory neglect.
- To determine whether dichotic presentation of verbal stimuli can attenuate auditory neglect.
- To explore the relationship between the content of auditory stimuli and the manifestation of neglect.
Main Methods:
- A dichotic listening test was administered to participants with right hemisphere lesions and auditory neglect.
- The test included six types of word pairs: unrelated, synonyms, antonyms, categorically related, compound words, and rhyming words.
- Auditory neglect was measured by the reduction or exacerbation of neglect following different word pair presentations.
Main Results:
- Semantically related word pairs significantly reduced auditory neglect.
- Dichotic presentation of rhyming words exacerbated auditory neglect.
- These results highlight the influence of stimulus content on auditory perception and neglect.
Conclusions:
- Auditory perception is strongly modulated by the specific content of auditory stimuli.
- Language centers can process degraded stimuli with salient linguistic content, potentially reducing neglect.
- Auditory neglect arises from a complex interplay between intact and impaired brain regions, with content-dependent selective processing.
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