Motion as a cue for viewpoint invariance |
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Authors: | Tamara Watson Alan Johnston Harold Hill Nikolaus Troje |
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Affiliation: | 1. Department of Psychology, University College London, UK;2. ATR Human Information Science Laboratories, Kyoto, Japan;3. Fakult?t für Psychologie, Ruhr-Universit?t-Bochum, Germany and Department of Psychology, Queen's University, Kingston, Ontario, Canada |
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Abstract: | Natural face and head movements were mapped onto a computer rendered three-dimensional average of 100 laser-scanned heads in order to isolate movement information from spatial cues and nonrigid movements from rigid head movements (Hill & Johnston, 2001). Experiment 1 investigated whether subjects could recognize, from a rotated view, facial motion that had previously been presented at a full-face view using a delayed match to sample experimental paradigm. Experiment 2 compared recognition for views that were either between or outside initially presented views. Experiment 3 compared discrimination at full face, three-quarters, and profile after learning at each of these views. A significant face inversion effect in Experiments 1 and 2 indicated subjects were using face-based information rather than more general motion or temporal cues for optimal performance. In each experiment recognition performance only ever declined with a change in viewpoint between sample and test views when rigid motion was present. Nonrigid, face-based motion appears to be encoded in a viewpoint invariant, object-centred manner, whereas rigid head movement is encoded in a more view specific manner. |
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