Abstract:
:Visual stimuli undetected by normal subjects as a result of masking procedures can nonetheless activate response preparation in motor areas and yield a motor response. An unanswered question is whether the same holds for undetected subliminal stimuli that are not responded to. To answer this question, in this study normal subjects were tested on a simple visual reaction time task with stimuli above, at, or below the psychophysical threshold while the lateralized readiness potential (LRP), i.e. an electrophysiological correlate of premotor activation in the primary motor cortex, was computed. We found a reliable LRP not only for suprathreshold stimuli but also for subthreshold stimuli to which subjects did not respond. The main thrust of this study is that it provides evidence that activation of the motor cortex occurs even with subthreshold visual stimuli and without an overt response.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Minelli A,Marzi CA,Girelli Mdoi
10.1007/s00221-006-0825-8subject
Has Abstractpub_date
2007-06-01 00:00:00pages
683-90issue
4eissn
0014-4819issn
1432-1106journal_volume
179pub_type
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