Kinematic cues for person identification from biological motion
TL;DR: No overall advantage for a single learning viewpoint was found, and there is considerable generalization to novel testing viewpoints in walkers shown from different viewpoints.
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Abstract: We examined the role of kinematic information for person identification. Observers learned to name seven walkers shown as point-light displays that were normalized by their size, shape, and gait frequency under a frontal, half-profile, or profile view. In two experiments, we analyzed the impact of individual harmonics as created by a Fourier analysis of a walking pattern, as well as the relative importance of the amplitude and the phase spectra in walkers shown from different viewpoints. The first harmonic contained most of the individual information, but performance was also above chance level when only the second harmonic was available. Normalization of the amplitude of a walking pattern resulted in a severe deterioration of performance, whereas the relative phase of the point lights was only used from a frontal viewpoint. No overall advantage for a single learning viewpoint was found, and there is considerable generalization to novel testing viewpoints.
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Citations
Stimulus magnification equates identification and discrimination of biological motion across the visual field.
TL;DR: It is concluded that size scaling is sufficient to equate discrimination and identification of point-light walkers across the visual field.
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Limits of peripheral direction discrimination of point-light walkers.
TL;DR: It is argued that the value of the modified direction-discrimination task lies in its focus on the limits of discrimination within the domain of interest, rather than the amount of noise needed to impair discrimination of widely separated stimulus values.
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Biological motion perception is cue-invariant
TL;DR: Psychophysically, using randomized-polarity and contrast-modulated stimuli, it is shown that detection of second-order biological motion walkers is worse for stimuli defined by second- order cues, but this difference is explained by a difference in visibility of the local motion in the stimuli.
Healthy Older Observers Cannot Use Biological-Motion Point-Light Information Efficiently within 4 m of Themselves:
TL;DR: Older observers are limited in their capacity to integrate information over larger areas of the visual field, which supports the notion that age-related effects are more apparent when larger neural networks are required to process simultaneous information and has further implications for social contexts where information from biological motion is critical.
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Recognizing Friends by Their Walk ; Gait Perception without Familiarity Cues
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