Cross-modal aftereffects of visuo-manual prism adaptation: Transfer to auditory divided attention in healthy subjects.

2021 ◽  
Author(s):  
Clémence Bonnet ◽  
Bénédicte Poulin-Charronnat ◽  
Corentin Vinot ◽  
Patrick Bard ◽  
Carine Michel
Keyword(s):  
Divided Attention ◽  
Healthy Subjects ◽  
Prism Adaptation

scholarly journals Improvement of phonemic fluency following leftward prism adaptation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Patrizia Turriziani ◽  
Gabriele Chiaramonte ◽  
Giuseppa Renata Mangano ◽  
Rosario Emanuele Bonaventura ◽  
Daniela Smirni ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Clinical Impact ◽  
Language Ability ◽  
Prism Adaptation ◽  
Hemispheric Lateralization ◽  
Functional Studies ◽  
Phonemic Fluency ◽  
Executive Dysfunctions ◽  
New Strategies ◽  
Fluency Task

AbstractAnatomo functional studies of prism adaptation (PA) have been shown to modulate a brain frontal-parieto-temporal network, increasing activation of this network in the hemisphere ipsilateral to the side of prism deviation. This effect raises the hypothesis that left prism adaptation, modulating frontal areas of the left hemisphere, could modify subjects’ performance on linguistic tasks that map on those areas. To test this hypothesis, 51 healthy subjects participated in experiments in which leftward or rightward prism adaptation were applied before the execution of a phonemic fluency task, i.e., a task with strict left hemispheric lateralization onto frontal areas. Results showed that leftward PA significantly increased the number of words produced whereas rightward PA did not significantly modulate phonemic fluency. The present findings document modulation of a language ability following prism adaptation. The results could have a huge clinical impact in neurological populations, opening new strategies of intervention for language and executive dysfunctions.

Assessment of Divided Attention: Development of a New Dual-Task Procedure

2004 ◽  
Vol 15 (2) ◽  
pp. 69-79 ◽  
Author(s):  
Cornelia Macek ◽  
Ina Brinkers ◽  
Thomas Beblo ◽  
Wolfgang Hartje
Keyword(s):  
Divided Attention ◽  
Dual Task ◽  
Healthy Subjects ◽  
Item Difficulty ◽  
Reliability And Validity ◽  
Auditory Stimuli ◽  
Simultaneous Occurrence ◽  
Rehabilitation Center ◽  
Neurological Rehabilitation ◽  
Preliminary Information

Abstract: A computerized dual-task procedure for the assessment of divided attention is described, which does not only allow for the concurrent presentation of visual and auditory stimuli, but also, by supplying two response keys, for the simultaneous occurrence of critical (to-be-responded-to) events in both stimulus channels. In scoring the performance, the two keys are always considered in conjunction, i.e., a response is scored as correct only if the two keys are handled in agreement with the pertaining constellation of the visual and auditory stimulation. The task was applied with 48 young healthy subjects. Analysis of the data with respect to item difficulty, reliability and validity supports the usefulness of the procedure. In order to obtain preliminary information on the clinical practicability of the procedure the task was also administered to 31 brain-damaged in-patients of a neurological rehabilitation center.

scholarly journals Unchanged EEG correlates of covert visual spatial attention after prism adaptation in healthy subjects

2018 ◽  
Author(s):  
Marjolein van der Waal ◽  
Inez Wijnands ◽  
Jason Farquhar
Keyword(s):  
Spatial Attention ◽  
Healthy Subjects ◽  
Prism Adaptation ◽  
Attention Task ◽  
Visual Spatial Attention ◽  
Visual Spatial ◽  
Brain Signals ◽  
Before And After ◽  
Behavioural Performance ◽  
P3 Component

Behavioural effects of prism adaptation in healthy subjects and neglect patients suggest a link between prism adaptation and spatial attention. A recent study found an effect of prism adaptation on several EEG correlates of spatial attention, but for two other correlates (the P3 component of the oddball ERP and alpha lateralization), the relationship remained unclear. In the current experiment, 10 healthy subjects performed a visual spatial attention task which was optimized for eliciting these two brain signals. This task was performed before and after adaptation to prism glasses with a leftward optical deviation. While prism adaptation induced a rightward bias on a pointing task, there was no effect of adaptation on behavioural performance on the spatial attention task. Moreover, the P3 component of the ERP and alpha lateralization were not influenced by prism adaptation. Together, these results show that some EEG correlates of visual spatial attention remain unchanged after prism adaptation, a finding which has its implications for current models of the neurocognitive mechanisms behind prism adaptation.

Reflex Responses in Upper Limb Muscles to Cutaneous Stimuli

1993 ◽  
Vol 20 (04) ◽  
pp. 271-278 ◽  
Author(s):  
R. Chen
Keyword(s):  
Stimulus Intensity ◽  
Upper Limb ◽  
Healthy Subjects ◽  
Voluntary Contraction ◽  
Cutaneous Reflexes ◽  
Focal Lesions ◽  
Normal Ranges ◽  
Conduction Velocities ◽  
Limb Muscles ◽  
Biphasic Responses

ABSTRACT:Cutaneous reflexes in the upper limb were elicited by stimulating digital nerves and recorded by averaging rectified EMG from proximal and distal upper limb muscles during voluntary contraction. Distal muscles often showed a triphasic response: an inhibition with onset about 50 ms (Il) followed by a facilitation with onset about 60 ms (E2) followed by another inhibition with onset about 80 ms (12). Proximal muscles generally showed biphasic responses beginning with facilitation or inhibition with onset at about 40 ms. Normal ranges for the amplitude of these components were established from recordings on 22 arms of 11 healthy subjects. An attempt was made to determine the alterent fibers responsible for the various components by varying the stimulus intensity, by causing ischemic block of larger fibers and by estimating the afferent conduction velocities. The central pathways mediating these reflexes were examined by estimating central delays and by studying patients with focal lesions

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