Formation of Face-Selective Detectors: ERP- And Dipole-Source Localization Study

Kozlovskiy, S.A.; Popova, A.V.; Shirenova, S.D.; Kiselnikov, A.A.; Chernorizov, A.M.; Danilova, N.N.

Авторы: Kozlovskiy Stanislav A., Popova Alla V., Shirenova Sophie D., Kiselnikov Andrey A., Chernorizov Alexander M., Danilova Nina N.
Журнал: International Journal of Psychophysiology
Том: 108
Год издания: 2016
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 68
Последняя страница: 68
DOI: 10.1016/j.ijpsycho.2016.07.223
Аннотация: The process of forming new detectors similar to face-selective detectors was investigated. Experimental design assumed that these new detectors were aimed to distinguish between pictures of animal faces. In set 1 the participants (N=20, age 18-28) were shown with photos of British cats’ faces. Each photo was presented for 800 ms followed by 1000 ms pause. Participants were shown with two photos of British cats’ faces after the pause so they have to identify previously shown photo. We use 9 different photos. In set 2 (training) a cat’s face appeared for 800 ms followed by a 3x3 matrix with cats’ faces. The task was to identify the photo shown before. In set 3 (control) other photos of cats’ faces were used and it was arranged in the same way as in set 1. EEG was registered for sets 1 and 3. ERPs were calculated for presentation of the stimuli that needed to be memorized. Correct responses in set 1 reached 33%, 40% for set 2 and 84% for set 3. The obtained data suggest that during training with the third set a new detector system that unravels subtle differences in face-like stimuli was formed. The mean group ERPs for the sets 1 and 3 were found to be significantly different in P200 and N400 components (Student’s T-test). Dipole sources of brain activity were calculated (BrainLoc localizing software, significance of localization ≥ 0.98). Around 200 ms latency after the presentation of stimulus in set 1 the prefrontal cortex (BA 9) in both hemispheres was highly active. In set 3 no activation of this area was observed, but the activation in the lingual gyrus was present instead. We suppose that before the detector system was formed stimuli were not perceived as integral images, so participants distinguished them by memorizing certain features, which requires additional cognitive control. Localization of the N400 component in set 1 revealed activation of left hemisphere of the cerebellum. In set 3 for the same latency the activation in the cerebellum was also present. In addition, activation foci were observed in the right middle temporal gyrus (BA 21), in the right parahippocampal gyrus (BA 35) and the right hippocampus. This corresponds with the previously published data (Quiroga et al., 2005), stating that these structures of human brain take part in detecting and recognition of particular faces. The research was supported by the Russian Foundation for Humanities (project # 16-06-00065).
Добавил в систему: Данилова Нина Николаевна

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Formation of Face-Selective Detectors: ERP- And Dipole-Source Localization Studyстатья Тезисы