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The Definitions Of Biological Motion

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Definitions of Biological Motion (BM) mostly center around work by Johansson (1973) on visual motion perception through his application of point-light display. Within this context BM refers to the patterns of movement characteristic to living organisms, thereby encompassing both human and animal locomotion, insofar as it is distinct from random patterns of movement, characterized in vertebrates by non-rigid patterns constrained by skeletal structures. Studies suggesting that human sensitivity to BM is indeed not limited to human locomotion as studies have found people capable of identifying the locomotion of a variety of animals including quadrupeds such as dogs (Pavlova, Krägeloh-Mann, Sokolov, & Birbaumer. 2001). BM contains significant …show more content…

elbows, knees, wrists, etc.). These points are then assembled to form patterns resembling the movement of human or non-human animals, often in loopable movements, The points are thereby capable of presenting global information, through the combined movement of the points, or local information, focus on a single joint. Indeed motion is a fundamental component in the processing of PLD as Pavlova et al. (2001) found that accuracy of recognition of static PLD failed to reach above chance. Multiple methods are available to produce PLD ranging from Johannson (1973) use of light bulbs attached to the bodies of assistants and then filmed in a dark room, which created more naturalistic portrayals of BM, to more recent methods, employing motion capture software in animation (Vanrie & Verfaille, 2004). Advantages to the use of motion capture and three-dimensional animation software include the ability to show the same PLD from multiple viewpoints changing the orientation.

Whether or not BM appears to be intrinsic has provided a variety of conclusions, mainly due to difficulty replicating results. In Johansson (1973) original study it was suggested that BM was an intrinsic or automatic response over a learned one. The majority of studies attempting to determine whether the perception of BM was intrinsic, made use developmental studies that either made use of preferential or discriminating forced choice tasks or

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