Human tactile perception is studied through digitized images of hand-drawn curves generated by subjects treated with various facial preparations. The drawings represent their subjective assessment of a small brush moving across the face. In this study, exploratory data analysis is carried out through a functional data analog of principal components analysis and curve decomposition based on Fourier representations. In addition, high-dimensional analysis of variance is adapted for mixed-model functional data and applied to test whether preparation effects are significant.
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Spitzner et al. (2003) studied this question.
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