Transient and persistent right ear extinction in dichotic listening

Abstract

Nine patients with aphasia had right ear extinction in dichotic listening to words in the first month after an ischemic stroke; they were reassessed after 3 months. Four showed complete recovery from the right ear extinction; in five, the abnormality persisted. In those who recovered, CT revealed a subcortical lesion lateral to the frontal horn of the lateral ventricle without a lesion of Heschl's gyrus or geniculo-temporal pathways; a lesion in those structures was found in patients who did not recover. As reported for subcortical aphasia, a subcortical mechanism may explain contralateral ear extinction in dichotic listening.

Anatomical correlates of visual and tactile extinction in humans: a clinical CT scan study.

“…'0 13 [26][27][28][29] In the group study of De Renzi et al, six of 15 patients (40%) with long lasting auditory extinction had subcortical lenticular lesions. 22 The lesion pattern of visual and tactile extinction may be compared with the anatomical findings in patients with neglect.…”

“…In seven patients (27-28, 30-31., 34., 43,46) extinction was associated with extrapersonal neglect. The regions most often involved were determined with reference to the templates of Damasio and Damasio.29 In the nine patients with visual extinction., the subcortical paraventricular occipital area was involved in five (26., 28 45 46 Table 3 Localisation and size of the deep vascular lesions in 11 patients with right-brain damage and visuospatial neglect not associated with extinction marginal gyrus of the inferior parietal lobule was damaged in five of seven patients (71%), in whom extinction was associated with hemineglect (27 and 30 subcortical, 28, 43, 46). The premotor and rolandic regions, and the paraventricular frontal and occipital areas were damaged in four such patients (57%).…”

Aphasia and auditory extinction: Preliminary evidence of binding

“…This was found when individuals were asked to identify and localise stimuli by reporting which stimulus was present in each sound hemifield. All six individuals with aphasia exhibited extinction; the strength of this finding is notable given the debate as to the frequency and robustness of auditory extinction for individuals with aphasia (Castro-Caldas et al, 1984). One possible reason for reported difficulty in demonstrating auditory extinction could be the use of headphones.…”

“…As mentioned previously, auditory extinction has been found for RH lesioned patients Shisler et al, 2004), and one study found auditory extinction for individuals with aphasia (Castro-Caldas, Guerreiro, & Confraria, 1984). CastroCaldas et al's (1984) results must be interpreted with caution, however, due to the linguistic stimuli used and because headphones were used to present stimuli to participants.…”

“…Given that researchers have found that aphasia may also be related to attention deficits (McNeil et al, 1991;Murray, 2000;Murray et al, 1998), it could be predicted that individuals with aphasia may also show a deficit in binding, similar to RH patients (Shisler et al, 2004). There is evidence to suggest that left hemisphere stroke patients demonstrate extinction similar to that seen in right hemisphere patients (Bouma & Ansink, 1988;Castro-Caldas et al, 1984;Poncet, Habib, & Robillard, 1987), although the nature of these deficits is not clear. One possibility explored in this set of studies is that a deficit in binding is related to the exhibition of extinction in this population.…”