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- Title
Effects of visuo-tactile stimulation on face perception.
- Authors
Gülbetekin, Evrim; Bayraktar, Seda; Kantar, Deniz; Altun, Enes; Er, Nurullah; Fidancı, Arda
- Abstract
Objective: The aim of the presented study is to find out if tactile stimulation on one's own face has any effect on face processing by using event related potentials (P300). Methods: Ten undergraduate students participated the study. Fourty facial stimuli (20 female, 20 male) were presented in the aqusition stage. The participants observed the faces fir the first session of the study, while in the second session a robotic finger was touched on their left cheeck for 3 s. The order of the sessions was counterbalanced between subjects. After the acquisition phase, the subjects were tested in a face memory task. During the acquisition and test phases, brain signals were recorded via 64-channel EEG system. RT and accuracy were recorded. Results: ERPs were averaged 200ms before (-200ms) and 1000ms after stimulus onset. The amplitude was measured at occipital, parietal occipito-parietal, temporal and frontal electrode sites (Ol, 02, P3, P4, P7, P8, PZ, PO3, PO4, PO7, PO8, FI, F2, F3, F4, F5, F6, F7, F8, T7, T8, TP7, TP8, TP9, TP10). P300 (25O-5OOms) responses at these electrode sites were examined while the subjects were observing faces. Mean amplitudes of electrode regions were analyzed by conducting repeated measures ANOVA. The results indicated that there was a significant difference among electrode sites during observation of faces p<.05. The amplitudes of P300 in parietal, occipital and PO sites were higher than that of amplitudes in the other sites. On the other hand, significant effects of electrode site p<.05, hemisphere p<.05.and interaction of site and hemisphere pc.05 were found on P300 responses during tactile stimulation. The amplitudes in frontal and temporal sites were significantly higher than that of amplitudes in the other sites pc.05. The accuracy between two conditions was also different pc.05. Conclusion: Overall, the findings have shown that being touched on one's self-face had a significant effect on processing of other faces.
- Subjects
FACE perception; TOUCH; SOMATOSENSORY cortex; UNDERGRADUATES; MEMORY testing; ELECTRODES
- Publication
Anatomy: International Journal of Experimental & Clinical Anatomy, 2020, Vol 14, pS146
- ISSN
1307-8798
- Publication type
Article