Decline in the fractal dimension of facial emotion perception due to repetitive exposure to stimuli T Takehara1, F Ochiai2, H Watanabe3, N Suzuki1 |
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1Dept. of Psychology, Doshisha University, Japan |
| Many studies have demonstrated that the structure of facial emotion perception can be represented in terms of dimensions of valence and arousal. Some studies have shown that this structure has a fractal dimension that differs significantly between photographic positive and negatives [Takehara et al, 2011, Perception, 40 ECVP Supplement, 74] and normal and noise-added faces [Takehara et al, 2012, Perception, 41 ECVP Supplement, 105]. In this study, we investigated the changes in the fractal dimensions of the structure of facial emotion perception in the former and latter halves of ten successive blocks. Statistical analysis revealed that the mean fractal dimension derived from the latter half (1.22 dimension) was lower than that of the former half (1.32 dimension); t (13) = 6.18, p < .001, indicating that repetitive exposure to facial stimuli might have reduced the fractal dimension. Since increase in fractal dimension is considered to be related with difficulties in perceiving facial emotions, it is plausible that the decrease in fractal dimension was due to repetitive exposure, which could improve emotion perception skill [Elfenbein, 2006, Journal of Nonverbal Behavior, 30, 21-36]. |
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