The objective of our work was to find whether the subthalamic nucleus (STN) is directly involved in cognitive activities, specifically in executive functions. Ten patients with idiopathic Parkinson's disease had P3 potentials recorded by externalized deep brain electrodes that were implanted in the STN or in its immediate vicinity. Two contacts of each electrode were positioned inside the STN according to clinical effect, perioperative microrecording, and stimulation. The P3 waves were recorded following the auditory stimulus in a standard oddball paradigm. They were compared with the P3 waves elicited from a protocol modified by a dual task with an increased demand on executive functions. The P3 potentials with a steep amplitude gradient evoked by the modified protocol were detected by the contacts in 8 of the 14 available electrodes, located either inside the STN or in its immediate vicinity. The modified protocol led to an increased latency of the P3 potential in 8 of 14 electrodes. No local field potentials of the standard P3 potentials were recorded. The P3 potentials related to the increased demand on executive functions were detected by the STN contacts known to have the best effect on Parkinsonian motor signs. This could suggest that the STN takes part in the executive function processing.

• MeSH
• antiparkinsonika škodlivé účinky   MeSH
• evokované potenciály fyziologie   MeSH
• hluboká mozková stimulace přístrojové vybavení   MeSH
• kognitivní poruchy diagnóza   patofyziologie   MeSH
• levodopa škodlivé účinky   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mikroelektrody MeSH
• neuropsychologické testy MeSH
• nucleus subthalamicus patofyziologie   MeSH
• Parkinsonova nemoc farmakoterapie   patofyziologie   MeSH
• polékové dyskineze etiologie   patofyziologie   MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antiparkinsonika MeSH
• levodopa MeSH

We studied the appearance of broadband oscillatory changes (ranging 2-45 Hz) induced by a cognitive task with two levels of complexity. The event-related de/synchronizations (ERD/S) in the subthalamic nucleus (STN) and in the anterior cingulate cortex (ACC) were evaluated in an executive function test. Four epilepsy surgery candidates with intracerebral electrodes implanted in the ACC and three Parkinson's disease patients with externalized deep brain stimulation electrodes implanted in the STN participated in the study. A Flanker test (FT) with visual stimuli (arrows) was performed. Subjects reacted to four types of stimuli presented on the monitor by pushing the right or left button: congruent arrows to the right or left side (simple task) and incongruent arrows to the right or left side (more difficult complex task). We explored the activation of STN and the activation of the ACC while processing the FT. Both conditions, i.e. congruent and incongruent, induced oscillatory changes in the ACC and also STN with significantly higher activation during incongruent trial. At variance with the ACC, in the STN not only the ERD beta but also the ERD alpha activity was significantly more activated by the incongruent condition. In line with our earlier studies, the STN appears to be involved in activities linked with increased cognitive load. The specificity and complexity of task-related activation of the STN might indicate the involvement of the STN in processes controlling human behaviour, e.g. in the selection and inhibition of competing alternatives.

• MeSH
• cingulární gyrus fyziologie   MeSH
• dospělí MeSH
• elektroencefalografie MeSH
• epilepsie patofyziologie   MeSH
• exekutivní funkce fyziologie   MeSH
• hluboká mozková stimulace MeSH
• implantované elektrody MeSH
• kognice fyziologie   MeSH
• lidé středního věku MeSH
• lidé MeSH
• magnetická rezonanční tomografie MeSH
• neuropsychologické testy MeSH
• nucleus subthalamicus fyziologie   MeSH
• Parkinsonova nemoc patofyziologie   terapie   MeSH
• počítačové zpracování signálu MeSH
• psychomotorický výkon fyziologie   MeSH
• světelná stimulace MeSH
• zraková percepce fyziologie   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH