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  • American Physiological Society  (3)
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  • American Physiological Society  (3)
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  • 1
    Online-Ressource
    Online-Ressource
    American Physiological Society ; 2016
    In:  Journal of Neurophysiology Vol. 115, No. 1 ( 2016-01-01), p. 80-91
    In: Journal of Neurophysiology, American Physiological Society, Vol. 115, No. 1 ( 2016-01-01), p. 80-91
    Kurzfassung: In nonhuman primates, tactile representation at the cortical level has mostly been studied using single-cell recordings targeted to specific cortical areas. In this study, we explored the representation of tactile information delivered to the face or the shoulders at the whole brain level, using functional magnetic resonance imaging (fMRI) in the nonhuman primate. We used air puffs delivered to the center of the face, the periphery of the face, or the shoulders. These stimulations elicited activations in numerous cortical areas, encompassing the primary and secondary somatosensory areas, prefrontal and premotor areas, and parietal, temporal, and cingulate areas as well as low-level visual cortex. Importantly, a specific parieto-temporo-prefrontal network responded to the three stimulations but presented a marked preference for air puffs directed to the center of the face. This network corresponds to areas that are also involved in near-space representation, as well as in the multisensory integration of information at the interface between this near space and the skin of the face, and is probably involved in the construction of a peripersonal space representation around the head.
    Materialart: Online-Ressource
    ISSN: 0022-3077 , 1522-1598
    RVK:
    Sprache: Englisch
    Verlag: American Physiological Society
    Publikationsdatum: 2016
    ZDB Id: 80161-6
    ZDB Id: 1467889-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Online-Ressource
    Online-Ressource
    American Physiological Society ; 2011
    In:  Journal of Neurophysiology Vol. 106, No. 2 ( 2011-08), p. 809-816
    In: Journal of Neurophysiology, American Physiological Society, Vol. 106, No. 2 ( 2011-08), p. 809-816
    Kurzfassung: Standard protocols testing the orientation of visuospatial attention usually present spatial cues before targets and compare valid-cue trials with invalid-cue trials. The valid/invalid contrast results in a relative behavioral or physiological difference that is generally interpreted as a benefit of attention orientation. However, growing evidence suggests that inhibitory control of response is closely involved in this kind of protocol that requires the subjects to withhold automatic responses to cues, probably biasing behavioral and physiological baselines. Here, we used two experiments to disentangle the inhibitory control of automatic responses from orienting of visuospatial attention in a saccadic reaction time task in humans, a variant of the classical cue-target detection task and a sustained visuospatial attentional task. Surprisingly, when referring to a simple target detection task in which there is no need to refrain from reacting to avoid inappropriate responses, we found no consistent evidence of facilitation of target detection at the attended location. Instead, we observed a cost at the unattended location. Departing from the classical view, our results suggest that reaction time measures of visuospatial attention probably relie on the attenuation of elementary processes involved in visual target detection and saccade initiation away from the attended location rather than on facilitation at the attended location. This highlights the need to use proper control conditions in experimental designs to disambiguate relative from absolute cueing benefits on target detection reaction times, both in psychophysical and neurophysiological studies.
    Materialart: Online-Ressource
    ISSN: 0022-3077 , 1522-1598
    RVK:
    Sprache: Englisch
    Verlag: American Physiological Society
    Publikationsdatum: 2011
    ZDB Id: 80161-6
    ZDB Id: 1467889-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Online-Ressource
    Online-Ressource
    American Physiological Society ; 2018
    In:  Journal of Neurophysiology Vol. 119, No. 3 ( 2018-03-01), p. 1037-1044
    In: Journal of Neurophysiology, American Physiological Society, Vol. 119, No. 3 ( 2018-03-01), p. 1037-1044
    Kurzfassung: Several premotor areas have been identified within primate cingulate cortex; however their function is yet to be uncovered. Recent brain imaging work in humans revealed a topographic anatomofunctional overlap between feedback processing during exploratory behaviors and the corresponding body fields in the rostral cingulate motor area (RCZa), suggesting an embodied representation of feedback. In particular, a face field in RCZa processes juice feedback. Here we tested an extension of the embodied principle in which unexpected or relevant information obtained through the eye or the face would be processed by face fields in cingulate motor areas, and whether this applied to monkey cingulate cortex. We show that activations for juice reward, eye movement, eye blink, and tactile stimulation on the face overlap over two subfields within the cingulate sulcus likely corresponding to the rostral and caudal cingulate motor areas. This suggests that in monkeys as is the case in humans, behaviorally relevant information is processed through multiple cingulate body/effector maps. NEW & NOTEWORTHY What is the role of cingulate motor areas? In this study we observed in monkeys that, as in humans, neural responses to face-related events, juice reward, eye movement, eye blink, and tactile stimulations, clustered redundantly in two separate cingulate subfields. This suggests that behaviorally relevant information is processed by multiple cingulate effector maps. Importantly, this overlap supports the principle that the cingulate cortex processes feedback based on where it is experienced on the body.
    Materialart: Online-Ressource
    ISSN: 0022-3077 , 1522-1598
    RVK:
    Sprache: Englisch
    Verlag: American Physiological Society
    Publikationsdatum: 2018
    ZDB Id: 80161-6
    ZDB Id: 1467889-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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