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NEREC, an effective brain mapping protocol for combined language and long-term memory functions
In: ISSN: 1525-5050 ; EISSN: 1525-5069 ; Epilepsy & Behavior ; https://hal.archives-ouvertes.fr/hal-01413830 ; Epilepsy & Behavior, [San Diego CA]: Elsevier B.V., 2015, 53, pp.140 - 148. ⟨10.1016/j.yebeh.2015.09.017⟩ (2015)
Abstract: International audience ; Temporal lobe epilepsy can induce functional plasticity in temporoparietal networks involved in language and long-term memory processing. Previous studies in healthy subjects have revealed the relative difficulty for this network to respond effectively across different experimental designs, as compared to more reactive regions such as frontal lobes. For a protocol to be optimal for clinical use, it has to first show robust effects in a healthy cohort. In this study, we developed a novel experimental paradigm entitled NEREC, which is able to reveal the robust participation of temporoparietal networks in a uniquely combined language and memory task, validated in an fMRI study with healthy subjects. Concretely, NEREC is composed of two runs: (a) an intermixed language-memory task (confrontation naming associated with encoding in nonverbal items, NE) to map language (i.e., word retrieval and lexico-semantic processes) combined with simultaneous long-term verbal memory encoding (NE items named but also explicitly memorized) and (b) a memory retrieval task of items encoded during NE (word recognition, REC) intermixed with new items. Word recognition is based on both perceptual-semantic familiarity (feeling of ‘know’) and accessing stored memory representations (remembering). In order to maximize the remembering and recruitment of medial temporal lobe structures, we increased REC difficulty by changing the modality of stimulus presentation (from nonverbal during NE to verbal during REC). We report that (a) temporoparietal activation during NE was attributable to both lexico-semantic (language) and memory (episodic encoding and semantic retrieval) processes; that (b) encoding activated the left hippocampus, bilateral fusiform, and bilateral inferior temporal gyri; and that (c) task recognition (recollection) activated the right hippocampus and bilateral but predominant left fusiform gyrus. The novelty of this protocol consists of (a) combining two tasks in one (language and long-term memory encoding/recall) instead of applying isolated tasks to map temporoparietal regions, (b) analyzing NE data based on performances recorded during REC, (c) double-mapping networks involved in naming and in long-term memory encoding and retrieval, (d) focusing on remembering with hippocampal activation and familiarity judgment with lateral temporal cortices activation, and (e) short duration of examination and feasibility. These aspects are of particular interest in patients with TLE, who frequently show impairment of these cognitive functions. Here, we show that the novel protocol is suited for this clinical evaluation.
Keyword: [SCCO]Cognitive science; [SDV]Life Sciences [q-bio]; [SHS]Humanities and Social Sciences; Encoding; Hippocampus; Language; Memory; Naming; Retrieval; Temporal
URL: https://hal.archives-ouvertes.fr/hal-01413830
https://doi.org/10.1016/j.yebeh.2015.09.017
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2
Hemispheric specialization for language according to grapho-phonemic transformation and gender. A divided visual field experiment.
In: ISSN: 0278-2626 ; EISSN: 1090-2147 ; Brain and Cognition ; https://hal.archives-ouvertes.fr/hal-00967645 ; Brain and Cognition, Elsevier, 2009, 69 (3), pp.465-71. ⟨10.1016/j.bandc.2008.10.001⟩ (2009)
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Modulation de la spécialisation hémisphérique du langage par le degré de transparence grapho-phonémique et le sexe. Etude comportementale en champ visuel divisé
In: ISSN: 2101-6739 ; Revue de neuropsychologie, neurosciences cognitives et cliniques ; https://hal.archives-ouvertes.fr/hal-00862010 ; Revue de neuropsychologie, neurosciences cognitives et cliniques, John Libbey Eurotext, 2009, 4 (1), pp.288-98. ⟨10.1684/nrp.2009.0051⟩ (2009)
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Functional MRI approach for assessing hemispheric predominance of regions activated by a phonological and a semantic task.
In: ISSN: 0720-048X ; European Journal of Radiology ; https://hal.archives-ouvertes.fr/hal-00798632 ; European Journal of Radiology, Elsevier, 2007, pp.63(2):274-85 (2007)
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Functional MRI approach for assessing hemispheric predominance of regions activated by a phonological and a semantic task
In: ISSN: 0720-048X ; European Journal of Radiology ; https://hal.archives-ouvertes.fr/hal-00169574 ; European Journal of Radiology, Elsevier, 2007, 63, pp.274-285 (2007)
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6
Hemispheric predominance assessment of phonology and semantics: A divided visual field experiment
In: ISSN: 0278-2626 ; EISSN: 1090-2147 ; Brain and Cognition ; https://hal.archives-ouvertes.fr/hal-00169565 ; Brain and Cognition, Elsevier, 2006, 61, pp.298-304. ⟨10.1016/j.bandc.2006.02.005⟩ (2006)
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