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Oscillatory systems and mental processes: Identification of target stimulus in experiments with working memoryстатья Тезисы
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
- Автор: Danilova N.N.
- Журнал: International Journal of Psychophysiology
- Том: 85
- Номер: 3
- Год издания: 2012
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 306
- Последняя страница: 306
- DOI: 10.1016/j.ijpsycho.2012.06.048
- Аннотация: Information about the surrounding world is represented in memory not only by representations as separate objects, landscapes, situations, actions, events, but also in the form of generalization, categories. Categorization is a vital cognitive process to correctly identify any object, event and connect it with the corresponding behavior. Remembering new objects and their identification also involves the process of categorization, aimed both at objects and actions at behavior level. The neural mechanisms of categorization are studied in three main directions: 1) the first aspect is the processes and brain structures involved in category representations of objects; 2) the second aspect of categorization is the selection of appropriate actions on the basis of category membership and their connection with the object, and 3) the third aspect is how categories are learned. Experimental data link the processes of categorization with the corticostriatal system connecting cortex and basal ganglia. This fact greatly reduces the researcher capability, because it requiresa registration of neuron activity in animals or using tomography methods to display activity in sub-lobar structures. To move the solution of this problem we used the new method of microstructure analysis of oscillatory brain activity based on the pacemaker hypothesis of the origin of EEC rhythms. The cluster analysis was applied to coordinates of equivalent dipoles for frequency-selective theta-, beta-and gamma-generators. The coordinates of the dipoles were converted to the Stereotactic Atlas of human brain (Talairach, Tournoux, 1988). The structure and dynamics mental processes connected with the identification of target and non-target stimuli were studied in the experiments with working memory. The subject had to memorize four different two-digit numbers (Stl) and retain them in memory during a delay interval for subsequent comparison with stimuli (St2 or St3). St2 (target) coincided with one of the two-digit numbers, and needed a motor reaction. St3 was non-target stimulus. The cluster analysis of joint activity of frequency-selective theta-, beta- and gamma-generators revealed a fundamental differ¬ence in identification of target and non-target stimuli. The target stimulus evoked a high activity in the dorsal striatum (n. caudate), which is associated with the generation of stimulus categorization, as well as in the basal ganglia (globus pallidum: 'GPi, GPe) responsible for the choice of executing motor reactions. In parallel there was activity in the Substania Nigra, indirectly confirming the categorical learning, which can occur both in the stimulus and the motor sphere. Non-target stimulus caused increasing activity in the temporal and occipital cortex with little involvement of striopallidum system. The total activity of frequency-selective theta generators as well as of frequency-selective gamma generators in response to non-target stimulus was higher than the target stimulus. The identification of the non-target stimulus is a more complicated process. It includes the searching of additional information confirming the correctness of an earlier decision making according to the inhibition of motor reaction.
- Добавил в систему: Данилова Нина Николаевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | This study was presented in the Symposium: Oscillatory systems of the brain, their role in the management of mental processes, behavior, and individual differences Symposium Chair: Vilfredo De Pascalis (Italy) and Nina Danilova (Russia) | Oscillatory_systems_and_mental_processes-_Identification_of… | 949,0 КБ | 28 сентября 2012 [DanilovaNN] |
| 2. | Полный текст | This study was presented in the Symposium: Oscillatory systems of the brain, their role in the management of mental processes, behavior, and individual differences Symposium Chair: Vilfredo De Pascalis (Italy) and Nina Danilova (Russia) | Oscillatory_systems_and_mental_processes-_Identification_of… | 949,0 КБ | 28 сентября 2012 [DanilovaNN] |