Hippocampal negative event-related potential recorded in humans during a simple sensorimotor task occurs independently of motor execution

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Authors

ROMAN Robert BRÁZDIL Milan CHLÁDEK Jan REKTOR Ivan JURÁK Pavel SVĚTLÁK Miroslav DAMBORSKÁ Alena SHAW Daniel Joel KUKLETA Miloslav

Year of publication 2013
Type Article in Periodical
Magazine / Source Hippocampus
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://onlinelibrary.wiley.com/doi/10.1002/hipo.22173/abstract;jsessionid=4068795D783BE1A4D586B1DBC14D6066.f02t01
Doi http://dx.doi.org/10.1002/hipo.22173
Field Neurology, neurosurgery, neurosciences
Keywords intracranial recordings; auditory task; hippocampus; ERP latency; motor response
Description A hippocampal prominent event-related potential (ERP) with a peak latency at around 450 ms is consistently observed as a correlate of hippocampal activity during various cognitive tasks. Some intracranial EEG studies demonstrated that the amplitude of this hippocampal potential was greater in response to stimuli requiring an overt motor response, in comparison with stimuli for which no motor response is required. These findings could indicate that hippocampal evoked activity is related to movement execution as well as stimulus evaluation and associated memory processes. The aim of the present study was to investigate the temporal relationship between the hippocampal negative potential latency and motor responses. We analyzed ERPs recorded with 22 depth electrodes implanted into the hippocampi of 11 epileptic patients. Subjects were instructed to press a button after the presentation of a tone. All investigated hippocampi generated a prominent negative ERP peaking at approximately 420 ms. In 16 from 22 cases we found that the ERP latency did not correlate with the reaction time; in different subjects, this potential could either precede or follow the motor response. Our results indicate that the hippocampal negative ERP occurs independently of motor execution. We suggest that hippocampal evoked activity, recorded in a simple sensorimotor task, is related to the evaluation of stimulus meaning within the context of situation.
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