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The role of spatial and temporal information in biological motion perception

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Lange J., Lappe M.
Advances in Cognitive Psychology
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2007
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vol. 3
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issue 4
419-428
EN
Point-light biological motion stimuli provide spa-tio-temporal information about the structure of the human body in motion. Manipulation of the spatial structure of point-light stimuli reduces the ability of human observers to perceive biological motion. A recent study has reported that interference with the spatial structure of point-light walkers also reduces the evoked event-related potentials over the occipitotemporal cortex, but that interference with the temporal structure of the stimuli evoked event-related potentials similar to normal biological motion stimuli. We systematically investigated the influence of spatial and temporal manipulation on 2 common discrimination tasks and compared it with predictions of a neurocomputational model previously proposed. This model first analyzes the spatial structure of the stimulus independently of the temporal information to derive body posture and subsequently analyzes the temporal sequence of body postures to derive movement direction. Similar to the model predictions, the psychophysical results show that human observers need only intact spatial configuration of the stimulus to discriminate the facing direction of a point-light walker. In contrast, movement direction discrimination needs a fully intact spatio-temporal pattern of the stimulus. The activation levels in the model predict the observed event-related potentials for the spatial and temporal manipulations.
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Investigating cognitive style differences in the perception of biological motion associated with visuospatial processing

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Thomson K., Watt A.
Polish Psychological Bulletin
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2013
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vol. 44
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issue 1
50-55
EN
The purpose of the study was to compare the visuospatial decision-making error scores related to the perception of biological motion of individuals categorized as fi eld dependent or fi eld independent. A sample of 69 participants aged 18-27 years (M = 21.91, SD = 2.39) that included 33 males and 36 females completed the experiment. Cognitive style was assessed using the Group Embedded Figure Test. Perception of biological motion was evaluated using two different point-light stimuli developed from video images of a ballet dancer’s performance of a correct and incorrect turn in the fi fth position. The results showed that individuals classifi ed as fi eld independent made signifi cantly fewer visuospatial processing errors. The fi ndings are considered and discussed in relation to theoretical perspectives associated with both cognitive processing and cognitive style.
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