Functional Differentiation in the Human Auditory and Language Areas Revealed by a Dichotic Listening Task

Hashimoto, Ryuichiro; Homae, Fumitaka; Nakajima, Kiyokazu; Miyashita, Yasushi; Sakai, Katsuyuki

doi:10.1006/nimg.2000.0603

Cited by 81 publications

(51 citation statements)

References 56 publications

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“…This general attentional effect is consistent with numerous auditory ERP studies (Hillyard et al, 1973;Woldorff et al, 1993; as well as with prior imaging studies using various speech (Grady et al, 1997;Hashimoto et al, 2000;Hugdahl et al, 2000;Hugdahl et al, 2003;Jancke et al, 2001;Jancke et al, 1999;O'Leary et al, 1997;Pugh et al, 1996;Vingerhoets & Luppens, 2001) and nonspeech (Hall et al, 2000;Jancke et al, 2003) auditory stimuli. Contrasts emphasizing speech sound processing (Speech-Rotated) and lexical processing (Word-Pseudoword) showed not only main effects of these stimulus variables but also strong interactions between attention and stimulus type.…”

Section: Discussionsupporting

confidence: 89%

Attentional and linguistic interactions in speech perception

et al. 2008

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The role of attention in speech comprehension is not well understood. We used fMRI to study the neural correlates of auditory word, pseudoword, and nonspeech (spectrally-rotated speech) perception during a bimodal (auditory, visual) selective attention task. In three conditions, Attend Auditory (ignore visual), Ignore Auditory (attend visual), and Visual (no auditory stimulation), 28 subjects performed a one-back matching task in the assigned attended modality. The visual task, attending to rapidly presented Japanese characters, was designed to be highly demanding in order to prevent attention to the simultaneously presented auditory stimuli. Regardless of stimulus type, attention to the auditory channel enhanced activation by the auditory stimuli (Attend Auditory > Ignore Auditory) in bilateral posterior superior temporal regions and left inferior frontal cortex. Across attentional conditions, there were main effects of speech processing (word + pseudoword > rotated speech) in left orbitofrontal cortex and several posterior right hemisphere regions, though these areas also showed strong interactions with attention (larger speech effects in the Attend Auditory than in the Ignore Auditory condition) and no significant speech effects in the Ignore Auditory condition. Several other regions, including the postcentral gyri, left supramarginal gyrus, and temporal lobes bilaterally, showed similar interactions due to the presence of speech effects only in the Attend Auditory condition. Main effects of lexicality (word > pseudoword) were isolated to a small region of the left lateral prefrontal cortex. Examination of this region showed significant word > pseudoword activation only in the Attend Auditory condition. Several other brain regions, including left ventromedial frontal lobe, left dorsal prefrontal cortex, and left middle temporal gyrus, showed attention × lexicality interactions due to the presence of lexical activation only in the Attend Auditory condition. These results support a model in which neutral speech presented in an unattended sensory channel undergoes relatively little processing beyond the early perceptual level. Specifically, processing of phonetic and lexical-semantic information appears to be very limited in such circumstances, consistent with prior behavioral studies.

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Section: Discussionsupporting

confidence: 89%

Attentional and linguistic interactions in speech perception

et al. 2008

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“…Recent fMRI studies have shown that the bilateral STG is related to auditory attention and conscious awareness of auditory stimuli [Hashimoto et al, 2000;Pugh et al, 1996], which is consistent with the fact that feedback control is conscious processing. However, the absence of significant activation in SLOW-NOR- Fig.…”

Section: Discussionsupporting

confidence: 66%

Brain activations during conscious self‐monitoring of speech production with delayed auditory feedback: An fMRI study

Hashimoto

Sakai

2003

Human Brain Mapping

Self Cite

163

141

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Abstract:When a speaker's voice returns to one's own ears with a 200-ms delay, the delay causes the speaker to speak less fluently. This phenomenon is called a delayed auditory feedback (DAF) effect. To investigate neural mechanisms of speech processing through the DAF effect, we conducted a functional magnetic resonance imaging (fMRI) experiment, in which we designed a paradigm to explore the conscious overt-speech processing and the automatic overt-speech processing separately, while reducing articulatory motion artifacts. The subjects were instructed to (1) read aloud visually presented sentences under real-time auditory feedback (NORMAL), (2) read aloud rapidly under real-time auditory feedback (FAST), (3) read aloud slowly under real-time auditory feedback (SLOW), and (4) read aloud under DAF (DELAY). In the contrasts of DELAY-NORMAL, DELAY-FAST, and DELAY-SLOW, the bilateral superior temporal gyrus (STG), the supramarginal gyrus (SMG), and the middle temporal gyrus (MTG) showed significant activation. Moreover, we found that the STG activation was correlated with the degree of DAF effect for all subjects. Because the temporo-parietal regions did not show significant activation in the comparisons among NORMAL, FAST, and SLOW conditions, we can exclude the possibility that its activation is due to speech rates or enhanced attention to altered speech sounds. These results suggest that the temporo-parietal regions function as a conscious self-monitoring system to support an automatic speech production system. Hum. Brain Mapping 20:22-28, 2003.

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“…The supratemporal plane is likely to comprise several distinct areas, as indicated by changes in cortical architecture (Galaburda and Sanides 1980), and area-like structures were identified with cytochrome oxidase and acetylcholinesterase histochemistry (Rivier and Clarke 1997). Recent connectivity (Tardif and Clarke 2001) and activation studies (Hashimoto et al 2000;Wessinger et al 2001) suggest hierarchical organization of these areas within the ventral, recognition pathway. Furthermore, human primary auditory cortex was shown to contain distinct intra-areal compartments, cytochrome oxidase dark and light stripes, that are reminiscent of compartments within human V1 and V2 and that may represent an early segregation of different processing pathways (Clarke and Rivier 1998).…”

Section: Discussionmentioning

confidence: 99%

What and Where in human audition: selective deficits following focal hemispheric lesions

Clarke¹,

Thiran²,

Maeder³

et al. 2002

Experimental Brain Research

196

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A sound that we hear in a natural setting allows us to identify the sound source and localize it in space. The two aspects can be disrupted independently as shown in a study of 15 patients with focal right-hemispheric lesions. Four patients were normal in sound recognition but severely impaired in sound localization, whereas three other patients had difficulties in recognizing sounds but localized them well. The lesions involved the inferior parietal and frontal cortices, and the superior temporal gyrus in patients with selective sound localization deficit; and the temporal pole and anterior part of the fusiform, inferior and middle temporal gyri in patients with selective recognition deficit. These results suggest separate cortical processing pathways for auditory recognition and localization.

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Functional Differentiation in the Human Auditory and Language Areas Revealed by a Dichotic Listening Task

Cited by 81 publications

References 56 publications

Attentional and linguistic interactions in speech perception

Attentional and linguistic interactions in speech perception

Brain activations during conscious self‐monitoring of speech production with delayed auditory feedback: An fMRI study

What and Where in human audition: selective deficits following focal hemispheric lesions

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