Abstract
Patients with auditory neglect attend less to auditory stimuli on their left and/or make systematic directional errors when indicating sound positions. Rightward prismatic adaptation (R-PA) was repeatedly shown to alleviate symptoms of visuospatial neglect and once to restore partially spatial bias in dichotic listening. It is currently unknown whether R-PA affects only this ear-related symptom or also other aspects of auditory neglect. We have investigated the effect of R-PA on left ear extinction in dichotic listening, space-related inattention assessed by diotic listening, and directional errors in auditory localization in patients with auditory neglect. The most striking effect of R-PA was the alleviation of left ear extinction in dichotic listening, which occurred in half of the patients with initial deficit. In contrast to nonresponders, their lesions spared the right dorsal attentional system and posterior temporal cortex. The beneficial effect of R-PA on an ear-related performance contrasted with detrimental effects on diotic listening and auditory localization. The former can be parsimoniously explained by the SHD-VAS model (shift in hemispheric dominance within the ventral attentional system; Clarke and Crottaz-Herbette 2016), which is based on the R-PA-induced shift of the right-dominant ventral attentional system to the left hemisphere. The negative effects in space-related tasks may be due to the complex nature of auditory space encoding at a cortical level.
Highlights
Unilateral spatial neglect tends to include distinct auditory deficits, which are often referred to as auditory neglect and are investigated with a variety of experimental paradigms [1]
The beneficial effect of Rightward prismatic adaptation (R-PA) on auditory neglect appears to be limited to the alleviation of left ear extinction in dichotic listening
This particular effect can be parsimoniously explained by the SHD-VAS model, that is, shift in hemispheric dominance within the ventral attentional system, induced by R-PA
Summary
Unilateral spatial neglect tends to include distinct auditory deficits, which are often referred to as auditory neglect and are investigated with a variety of experimental paradigms [1]. The key feature of auditory neglect, impaired attention to left-sided stimuli, has been initially revealed in tasks of dichotic listening. In this paradigm, simultaneous auditory stimuli are presented to either ear; extinction or significant decrease in reporting stimuli presented to the left ear has been considered as a manifestation of auditory neglect [2, 3]. The ambiguity in the interpretation of left ear extinction as a sign of auditory neglect has led to the introduction of the diotic listening paradigm, which consists of two simultaneous stimuli presented to the right or left by means of interaural time differences.
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