Dynamic movements of the hand, fingers, and thumb are difficult to measure due to the versatility and complexity of movement inherent in function. An innovative approach to measuring hand kinematics is proposed and validated. The proposed system utilizes the Microsoft Kinect and goes beyond gesture recognition to develop a validated measurement technique of finger kinematics. The proposed system adopted landmark definition (validated through ground truth estimation against assessors) and grip classification algorithms, including kinematic definitions (validated against a laboratory-based motion capture system). The results of the validation show 78% accuracy when identifying specific markerless landmarks. In addition, comparative data with a previously validated kinematic measurement technique show accuracy of MCP ± 10° (average absolute error (AAE) = 2.4°), PIP ± 12° (AAE = 4.8°), and DIP ± 11° (AAE = 4.8°). These results are notably better than clinically based alternative manual measurement techniques. The ability to measure hand movements, and therefore functional dexterity, without interfering with underlying composite movements, is the paramount objective to any bespoke measurement system. The proposed system is the first validated markerless measurement system using the Microsoft Kinect that is capable of measuring finger joint kinematics. It is suitable for home-based motion capture for the hand and, therefore, achieves this objective.
This paper looks briefly at the case study of Russian sexual serial killer Andrei Chikatilo. Whilst serial homicide has received wide ranging attention more broadly in the literature, Chikatilo's criminality and sexually deviant behaviour have thus far lacked any in-depth psychological explanation, with his crimes attributed tentatively to dysfunction upbringing and innate deviance. However, based on theoretical arguments presented in the present investigation, a more detailed account of what may have contributed to the development of such extreme sexual violence and cognitive distortions is discussed. Consideration of psychodynamic and behaviourist perspectives lead to the conclusion that a complex interaction of biological, psychological, and sociological factors may account for the onset and continuation of his homicidal behaviour.
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