Cortical systems for local and global integration in discourse comprehension

Egidi, Giovanna; Caramazza, Alfonso

doi:10.1016/j.neuroimage.2013.01.003

Cited by 31 publications

(25 citation statements)

References 83 publications

(142 reference statements)

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“…On the left, this network also includes a portion of the ventromedial PFC (vmPFC), and temporal areas such as posterior MTG, middle temporal sulcus (MTS) and ITG. Based on corroborating evidence von Cramon, 2001, 2002;Hasson et al, 2007;Perani et al, 1996Perani et al, , 1998Vingerhoets et al, 2003), we have suggested that activity in these areas indicates an integration process of continuous, fluent, monotonic updating of a knowledge base (Egidi and Caramazza, 2013), which we will call here accumulation of information. Some of the studies that have found a pattern of increased activation for consistent information in these regions have also found the opposite pattern in the inconsistency processing network (e.g., Hasson et al, 2007).…”

Section: Introductionsupporting

confidence: 65%

“…We have elsewhere proposed and provided evidence for a neural network involved in fluent processing, which is associated with the inverse pattern of activation, that is, greater signal change for consistent than inconsistent information in regions with above-baseline activation (Egidi and Caramazza, 2013). This pattern is less well understood and is found in a network that includes precentral gyrus (PreCG), posterior superior frontal gyrus (SFG), middle postcentral gyrus (PostCG), angular gyrus (AG), superior parietal lobule (SPL), central cingulate gyrus (CinG), anterior cuneus and the anterior parieto-occipital sulcus (POS).…”

Section: Introductionmentioning

confidence: 99%

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Mood-dependent integration in discourse comprehension: Happy and sad moods affect consistency processing via different brain networks

Egidi

Caramazza

2014

NeuroImage

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Section: Introductionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Mood-dependent integration in discourse comprehension: Happy and sad moods affect consistency processing via different brain networks

Egidi

Caramazza

2014

NeuroImage

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“…2A). In contrast, when we compared the sound envelope of the same utterances to the corresponding ECoG activity recorded in the superior parietal gyrus, an area not involved in language generation and showing weak functional MRI signal during discourse comprehension (9), no periodic variations in correlation amplitudes were found (Fig. 2B).…”

Section: Resultsmentioning

confidence: 93%

Sound representation in higher language areas during language generation

Magrassi

Aromataris

Cabrini

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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How language is encoded by neural activity in the higher-level language areas of humans is still largely unknown. We investigated whether the electrophysiological activity of Broca's area correlates with the sound of the utterances produced. During speech perception, the electric cortical activity of the auditory areas correlates with the sound envelope of the utterances. In our experiment, we compared the electrocorticogram recorded during awake neurosurgical operations in Broca's area and in the dominant temporal lobe with the sound envelope of single words versus sentences read aloud or mentally by the patients. Our results indicate that the electrocorticogram correlates with the sound envelope of the utterances, starting before any sound is produced and even in the absence of speech, when the patient is reading mentally. No correlations were found when the electrocorticogram was recorded in the superior parietal gyrus, an area not directly involved in language generation, or in Broca's area when the participants were executing a repetitive motor task, which did not include any linguistic content, with their dominant hand. The distribution of suprathreshold correlations across frequencies of cortical activities varied whether the sound envelope derived from words or sentences. Our results suggest the activity of language areas is organized by sound when language is generated before any utterance is produced or heard.A n important aspect of human language is speech production, although language may be generated independently from sound, as when one writes or thinks. However, introspection seems to suggest that our thoughts resound in our brain, much as if we were listening to an internal speech, yielding the impression/illusion that sound is inseparable from language.When human subjects listen to utterances, the neural activity in the superior temporal gyrus is modulated to track the envelope of the acoustic stimulus. The correlation between the power envelope of the speech and the neural activity is maximal at low frequencies (2-7 Hz, theta range) corresponding to syllable rates, and becomes less precise at higher frequencies (15-150 Hz, gamma range) corresponding to phoneme rates (1). Entrainment of neural activity to the speech envelope in auditory regions has allowed recognition of the phonetic features heard during speech perception (2-5), and even the reconstruction of simple words (6). This evidence indicates that during listening, speech representation in the auditory cortex and adjacent areas of the superior temporal lobe reflects acoustic features directly related to linguistically defined phonological entities such as phonemes and syllables. The relationship of specific patterns of sound amplitude and frequency to all similar patterns experienced over phylogeny and individual ontogeny is then responsible for sound perceptions (7). Moreover, as for subjects listening to natural speech, spatiotemporal features of the acoustic trace representative of the sound of the listened words have also been detec...

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“…In recent years functional magnetic resonance imaging (fMRI) studies have begun to reveal a network of regions that contributes to the construction of coherent mental representations of narratives (e.g., Egidi & Caramazza, 2013;Ferstl & Von Cramon, 2001;Mason & Just, 2006;Virtue, Haberman, Clacny, Parrish, & Beeman, 2006;Xu, Kemeny, Park, Frattali, & Braun, 2005;Yarkoni, Speer, & Zacks, 2008), as well as expository texts (e.g., Aboud, Bailey, Petrill, & Cutting, 2016;Moss & Schunn, 2015;Swett et al, 2013). In a comprehensive meta-analysis of neuroimaging studies on text comprehension processes, Ferstl, Neumann, Bogler, and von Cramon (2008) showed that this type of higher level language comprehension involves activation in many brain regions.…”

mentioning

confidence: 99%