Dépouillements

Source localization of brain electric field frequency bands during conscious, spontaneous, visual imagery and abstract thought / D. LEHMANN in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.203-210 Titre : Source localization of brain electric field frequency bands during conscious, spontaneous, visual imagery and abstract thought Type de document : Texte imprimé et/ou numérique Auteurs : D. LEHMANN, Auteur ; B. HENGGELER, Auteur ; M. KOUKKOU, Auteur ; C.M. MICHEL, Auteur Année de publication : 1993 Article en page(s) : p.203-210 Langues : Anglais (eng) Mots-clés : Source-localization EEG-frequency-band Mentation-class Consciousness Spontaneous-thought Visual-imagery Index. décimale : PER Périodiques Résumé : This paper addresses the issue of mind-brain correspondence, using a novel way to reduce brain electric field data in the frequency domain to estimates of intracerebral model source locations, and applying this method to brain electric data collected during the 2-s epochs immediately before the randomly solicited reports of spontaneous, conscious, covert experiences from 12 normal volunteers. The mentation reports were classified into visual imagery and abstract thought. The mean locations of the EEG model sources associated with abstract thoughts were generally more anterior and deeper than those of visual imagery, particularly significant for the delta/theta band; the finding was common across subjects. Thus, different brain functional states involving different geometries of activated neural populations exist during conscious, spontaneous, task-free mentations of the visual imagery type and of the abstract thought type. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=781 [article] Source localization of brain electric field frequency bands during conscious, spontaneous, visual imagery and abstract thought [Texte imprimé et/ou numérique] / D. LEHMANN, Auteur ; B. HENGGELER, Auteur ; M. KOUKKOU, Auteur ; C.M. MICHEL, Auteur . - 1993 . - p.203-210. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.203-210 Mots-clés : Source-localization EEG-frequency-band Mentation-class Consciousness Spontaneous-thought Visual-imagery Index. décimale : PER Périodiques Résumé : This paper addresses the issue of mind-brain correspondence, using a novel way to reduce brain electric field data in the frequency domain to estimates of intracerebral model source locations, and applying this method to brain electric data collected during the 2-s epochs immediately before the randomly solicited reports of spontaneous, conscious, covert experiences from 12 normal volunteers. The mentation reports were classified into visual imagery and abstract thought. The mean locations of the EEG model sources associated with abstract thoughts were generally more anterior and deeper than those of visual imagery, particularly significant for the delta/theta band; the finding was common across subjects. Thus, different brain functional states involving different geometries of activated neural populations exist during conscious, spontaneous, task-free mentations of the visual imagery type and of the abstract thought type. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=781

The effects of inferior temporal and dorsolateral frontal lesions on serial-order behavior and visual imagery in monkeys / Michael COLOMBO in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.211-217 Titre : The effects of inferior temporal and dorsolateral frontal lesions on serial-order behavior and visual imagery in monkeys Type de document : Texte imprimé et/ou numérique Auteurs : Michael COLOMBO, Auteur ; Anne E. EICKHOFF, Auteur ; Charles G. GROSS, Auteur Année de publication : 1993 Article en page(s) : p.211-217 Langues : Anglais (eng) Mots-clés : Inferior-temporal-cortex Dorsolateral-frontal-cortex Serial-order-behavior Visual-imagery Index. décimale : PER Périodiques Résumé : Four monkeys were trained preoperatively on a serial-order task to respond to a set of five visual stimuli in a fixed sequence independent of their location. They were then given a test of visual imagery in which only two of the five stimuli appeared at a time, and the animals were required to respond to them in the order in which they appeared in the original sequence. The monkeys then received bilateral lesions of either inferior temporal cortex or dorsolateral frontal cortex. Dorsolateral frontal lesions had no effect on either serial-order behavior or visual imagery. In contrast, inferior temporal lesions severely impaired serial-order behavior. Once the serial-order task was relearned, however, the inferior temporal animals were completely normal on the test of visual imagery. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] The effects of inferior temporal and dorsolateral frontal lesions on serial-order behavior and visual imagery in monkeys [Texte imprimé et/ou numérique] / Michael COLOMBO, Auteur ; Anne E. EICKHOFF, Auteur ; Charles G. GROSS, Auteur . - 1993 . - p.211-217. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.211-217 Mots-clés : Inferior-temporal-cortex Dorsolateral-frontal-cortex Serial-order-behavior Visual-imagery Index. décimale : PER Périodiques Résumé : Four monkeys were trained preoperatively on a serial-order task to respond to a set of five visual stimuli in a fixed sequence independent of their location. They were then given a test of visual imagery in which only two of the five stimuli appeared at a time, and the animals were required to respond to them in the order in which they appeared in the original sequence. The monkeys then received bilateral lesions of either inferior temporal cortex or dorsolateral frontal cortex. Dorsolateral frontal lesions had no effect on either serial-order behavior or visual imagery. In contrast, inferior temporal lesions severely impaired serial-order behavior. Once the serial-order task was relearned, however, the inferior temporal animals were completely normal on the test of visual imagery. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782

Influence of reading habits on line bisection / Sylvie CHOKRON in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.219-222 Titre : Influence of reading habits on line bisection Type de document : Texte imprimé et/ou numérique Auteurs : Sylvie CHOKRON, Auteur ; Michel IMBERT, Auteur Année de publication : 1993 Article en page(s) : p.219-222 Langues : Anglais (eng) Mots-clés : Reading-habit Line-bisection Hemispheric-activation Neglect-syndrome Index. décimale : PER Périodiques Résumé : The effect of scanning direction on perception of space is studied with a visuo-motor bisection task, among 120 normal dextrals with opposite reading habits (60 French subjects, 60 Israeli subjects). Bisection is found to depend upon subject's reading habits. Israeli bisected the line to the right of the objective centre, while French subjects placed their subjective middle to the left of the objective one. Results are discussed with respect to hemispheric activation theories, directional hypotheses and the neglect syndrome. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] Influence of reading habits on line bisection [Texte imprimé et/ou numérique] / Sylvie CHOKRON, Auteur ; Michel IMBERT, Auteur . - 1993 . - p.219-222. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.219-222 Mots-clés : Reading-habit Line-bisection Hemispheric-activation Neglect-syndrome Index. décimale : PER Périodiques Résumé : The effect of scanning direction on perception of space is studied with a visuo-motor bisection task, among 120 normal dextrals with opposite reading habits (60 French subjects, 60 Israeli subjects). Bisection is found to depend upon subject's reading habits. Israeli bisected the line to the right of the objective centre, while French subjects placed their subjective middle to the left of the objective one. Results are discussed with respect to hemispheric activation theories, directional hypotheses and the neglect syndrome. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782

Cognitive impairment following traumatic brain injury: the effect of pre- and post-injury administration of scopolamine and MK-801 / Robert J. HAMM in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.223-226 Titre : Cognitive impairment following traumatic brain injury: the effect of pre- and post-injury administration of scopolamine and MK-801 Type de document : Texte imprimé et/ou numérique Auteurs : Robert J. HAMM, Auteur ; Dianne M. O'DELL, Auteur ; Brian R. PIKE, Auteur ; Bruce G. LYETH, Auteur Année de publication : 1993 Article en page(s) : p.223-226 Langues : Anglais (eng) Mots-clés : Traumatic-brain-injury Morris-water-maze Scopolamine;MK-801 Rat Index. décimale : PER Périodiques Résumé : In order to examine the effectiveness of pre- and post-injury administration of muscarinic cholinergic and NMDA antagonists in reducing cognitive deficits following traumatic brain injury (TBI), rats were injected with either scopolamine (1 mg/kg) or MK-801 (0.3 mg/kg) 15 min prior to or 15 min after fluid percussion TBI. Cognitive performance was assessed with the Morris water maze procedure on days 11–15 after TBI or sham injury. When scopolamine and MK-801 were injected 15 min before injury, Morris water maze deficits were significantly reduced (P < 0.01 and P < 0.05, respectively). When scopolamine and MK-801 were injected 15 min after TBI, neither drug was effective in attenuating Morris water maze deficits. Consistent with other research, these results suggest that the cognitive deficits produced by TBI are the consequence of a brief period of excessive excitation of cholinergic and NMDA receptor systems. The results of this experiment also suggest that the temporal therapeutic window for the treatment of cognitive dysfunction with receptor antagonist intervention appears to be quite brief ( < 15 min) in the rat. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] Cognitive impairment following traumatic brain injury: the effect of pre- and post-injury administration of scopolamine and MK-801 [Texte imprimé et/ou numérique] / Robert J. HAMM, Auteur ; Dianne M. O'DELL, Auteur ; Brian R. PIKE, Auteur ; Bruce G. LYETH, Auteur . - 1993 . - p.223-226. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.223-226 Mots-clés : Traumatic-brain-injury Morris-water-maze Scopolamine;MK-801 Rat Index. décimale : PER Périodiques Résumé : In order to examine the effectiveness of pre- and post-injury administration of muscarinic cholinergic and NMDA antagonists in reducing cognitive deficits following traumatic brain injury (TBI), rats were injected with either scopolamine (1 mg/kg) or MK-801 (0.3 mg/kg) 15 min prior to or 15 min after fluid percussion TBI. Cognitive performance was assessed with the Morris water maze procedure on days 11–15 after TBI or sham injury. When scopolamine and MK-801 were injected 15 min before injury, Morris water maze deficits were significantly reduced (P < 0.01 and P < 0.05, respectively). When scopolamine and MK-801 were injected 15 min after TBI, neither drug was effective in attenuating Morris water maze deficits. Consistent with other research, these results suggest that the cognitive deficits produced by TBI are the consequence of a brief period of excessive excitation of cholinergic and NMDA receptor systems. The results of this experiment also suggest that the temporal therapeutic window for the treatment of cognitive dysfunction with receptor antagonist intervention appears to be quite brief ( < 15 min) in the rat. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782

Anatomical substrates of auditory selective attention: behavioral and electrophysiological effects of posterior association cortex lesions / D.L. WOODS in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.227-240 Titre : Anatomical substrates of auditory selective attention: behavioral and electrophysiological effects of posterior association cortex lesions Type de document : Texte imprimé et/ou numérique Auteurs : D.L. WOODS, Auteur ; R.T. KNIGHT, Auteur ; D. SCABINI, Auteur Année de publication : 1993 Article en page(s) : p.227-240 Langues : Anglais (eng) Mots-clés : Attention Auditory Event-related-potential Temporal Parietal Cortex Orienting Hemisphere Reaction-time Lesion Index. décimale : PER Périodiques Résumé : Even-related brain potentials (ERPs) and reaction times (RTs) were recorded in an auditory selective attention task in control subjects and two groups of patients with lesions centered in (1) the temporal/parietal junction (T/P, n = 9); and (2) the inferior parietal lobe (IPL, n = 7). High pitched tones were presented to one ear and low pitched tones to the other in random sequences that included infrequent longer-duration tones and occasional novel sounds. Subjects attended to a specified ear and pressed a button to the longer-duration tones in that ear. IPL and T/P lesions slowed reaction times (RTs) and increased error rates, but improved one aspect of performance — patients showed less distraction than controls when targets followed novel sounds. T/P lesions reduced the amplitude of early sensory ERPs, initially over the damaged hemisphere (N1a, 70–110 ms) and then bilaterally (N1b, 110–130 ms, and N1c 130–160 ms). The reduction was accentuated for tones presented contralateral to the lesion, suggesting that N1 generators receive excitatory input primarily from the contralateral ear. IPL lesions reduced N1 amplitudes to both low frequency tones and novel sounds. Nd components associated with attentional selection were diminished over both hemispheres in the T/P group and over the lesioned hemisphere in the IPL group independent of ear of stimulation. Target and novel N2s tended to be diminished by IPL lesions but were unaffected by T/P lesions. The mismatch negativity was unaffected by either T/P or IPL lesions. The results support different roles of T/P and IPL cortex in auditory selective attention. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] Anatomical substrates of auditory selective attention: behavioral and electrophysiological effects of posterior association cortex lesions [Texte imprimé et/ou numérique] / D.L. WOODS, Auteur ; R.T. KNIGHT, Auteur ; D. SCABINI, Auteur . - 1993 . - p.227-240. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.227-240 Mots-clés : Attention Auditory Event-related-potential Temporal Parietal Cortex Orienting Hemisphere Reaction-time Lesion Index. décimale : PER Périodiques Résumé : Even-related brain potentials (ERPs) and reaction times (RTs) were recorded in an auditory selective attention task in control subjects and two groups of patients with lesions centered in (1) the temporal/parietal junction (T/P, n = 9); and (2) the inferior parietal lobe (IPL, n = 7). High pitched tones were presented to one ear and low pitched tones to the other in random sequences that included infrequent longer-duration tones and occasional novel sounds. Subjects attended to a specified ear and pressed a button to the longer-duration tones in that ear. IPL and T/P lesions slowed reaction times (RTs) and increased error rates, but improved one aspect of performance — patients showed less distraction than controls when targets followed novel sounds. T/P lesions reduced the amplitude of early sensory ERPs, initially over the damaged hemisphere (N1a, 70–110 ms) and then bilaterally (N1b, 110–130 ms, and N1c 130–160 ms). The reduction was accentuated for tones presented contralateral to the lesion, suggesting that N1 generators receive excitatory input primarily from the contralateral ear. IPL lesions reduced N1 amplitudes to both low frequency tones and novel sounds. Nd components associated with attentional selection were diminished over both hemispheres in the T/P group and over the lesioned hemisphere in the IPL group independent of ear of stimulation. Target and novel N2s tended to be diminished by IPL lesions but were unaffected by T/P lesions. The mismatch negativity was unaffected by either T/P or IPL lesions. The results support different roles of T/P and IPL cortex in auditory selective attention. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782

The influence of long-term practice on mental rotation of 3-D objects / Gilles LEONE in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.241-255 Titre : The influence of long-term practice on mental rotation of 3-D objects Type de document : Texte imprimé et/ou numérique Auteurs : Gilles LEONE, Auteur ; Marie Claire TAINE, Auteur ; Jacques DROULEZ, Auteur Année de publication : 1993 Article en page(s) : p.241-255 Langues : Anglais (eng) Mots-clés : Mental-rotation 3-D-object Practice Imaging-skill Complexity Index. décimale : PER Périodiques Résumé : We evaluated the influence of long-term practice on the performance of a mental rotation task in which subjects judged whether two 3-D objects presented in different orientations were identical. Stimuli and experimental conditions were analogous to those used by Shepard and Metzler. Sixteen subjects were selected, to test the influence of aptitude for mental imagery on this learning process. Subjects participated in 12 to 15 sessions over 6 weeks. Two catalogues of different stimuli were alternatively used during three (or six) consecutive sessions to determine the influence of complexity and familiarity of figures. For all subjects, the inverse of the velocity of mental rotation along the sessions was adequately fitted by a decreasing exponential curve. However, evidence for mental rotation did not disappear, even after 15 sessions. Asymptotic variations can be attributed to differences in stimuli as well as imaging skills of subjects. Our results lead to a new interpretation of the mental rotation process. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] The influence of long-term practice on mental rotation of 3-D objects [Texte imprimé et/ou numérique] / Gilles LEONE, Auteur ; Marie Claire TAINE, Auteur ; Jacques DROULEZ, Auteur . - 1993 . - p.241-255. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.241-255 Mots-clés : Mental-rotation 3-D-object Practice Imaging-skill Complexity Index. décimale : PER Périodiques Résumé : We evaluated the influence of long-term practice on the performance of a mental rotation task in which subjects judged whether two 3-D objects presented in different orientations were identical. Stimuli and experimental conditions were analogous to those used by Shepard and Metzler. Sixteen subjects were selected, to test the influence of aptitude for mental imagery on this learning process. Subjects participated in 12 to 15 sessions over 6 weeks. Two catalogues of different stimuli were alternatively used during three (or six) consecutive sessions to determine the influence of complexity and familiarity of figures. For all subjects, the inverse of the velocity of mental rotation along the sessions was adequately fitted by a decreasing exponential curve. However, evidence for mental rotation did not disappear, even after 15 sessions. Asymptotic variations can be attributed to differences in stimuli as well as imaging skills of subjects. Our results lead to a new interpretation of the mental rotation process. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782

Peripherally administered IL-1α interferes with scopolamine-induced amnesia in mice / Mauro BIANCHI in Cognitive Brain Research, 1-4 (December 1993)

Public ISBD [article]  inCognitive Brain Research > 1-4 (December 1993) . - p.257-259 Titre : Peripherally administered IL-1α interferes with scopolamine-induced amnesia in mice Type de document : Texte imprimé et/ou numérique Auteurs : Mauro BIANCHI, Auteur ; Alberto E. PANERAI, Auteur Année de publication : 1993 Article en page(s) : p.257-259 Langues : Anglais (eng) Index. décimale : PER Périodiques Résumé : We studied the effects of human recombinant interleukin-1α on scopolamine-induced amnesia for a passive avoidance response in the mouse. Post-training intraperitoneal administration of the cytokine (0.25 or 0.50 μg/mouse) significantly reduced the amnesic effect of scopolamine (1.0 mg/kg i.p.). Our results indicate that peripheral interleukin-1α can influence behavior and suggest the involvement of the cholinergic system in the neuromodulatory actions of this cytokine. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782 [article] Peripherally administered IL-1α interferes with scopolamine-induced amnesia in mice [Texte imprimé et/ou numérique] / Mauro BIANCHI, Auteur ; Alberto E. PANERAI, Auteur . - 1993 . - p.257-259. Langues : Anglais (eng) in Cognitive Brain Research > 1-4 (December 1993) . - p.257-259 Index. décimale : PER Périodiques Résumé : We studied the effects of human recombinant interleukin-1α on scopolamine-induced amnesia for a passive avoidance response in the mouse. Post-training intraperitoneal administration of the cytokine (0.25 or 0.50 μg/mouse) significantly reduced the amnesic effect of scopolamine (1.0 mg/kg i.p.). Our results indicate that peripheral interleukin-1α can influence behavior and suggest the involvement of the cholinergic system in the neuromodulatory actions of this cytokine. Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=782