bei Google ScholarTitelangaben
Götz, Theresa ; Huonker, Ralph ; Miltner, Wolfgang ; Witte, Otto ; Dettner, Konrad ; Weiss, Thomas:
Task requirements change signal strength of the primary somatosensory M50 : Oddball vs. one-back tasks.
In: Psychophysiology.
Bd. 48
(2011)
Heft 4
.
- S. 569-577.
ISSN 1540-5958
DOI: https://doi.org/10.1111/j.1469-8986.2010.01116.x
Abstract
Studies on attention to tactile stimuli have produced conflicting results concerning the possibility and/or direction ofmodulation of early somatosensory-evoked fields (SEFs). To evaluate sources of these conflicting results, the samesubjects performed four different tasks in which the stimulation site, type, and intensity were kept constant. Twelvesubjects performed an oddball-like tactile task, two different one-back tactile tasks, and a visual task, while two distalphalanges of the index and ring finger were stimulated. Task-dependent SEFmodulations were found as early as 50 msafter stimulus onset (M50 component). Target/non-target ratios of M50 revealed enhanced values for the oddball-liketactile task, but decreased values for the tactile one-back task. This indicates that previously obtained conflicting resultsmight be due to different central mechanisms induced by different task requirements.