Inspiration for a linguistic approach to human activity representation comes from converging evidence in several fields of science such as cognitive science, neuroscience, neurophysiology, and psychophysics. We advocate a linguistic representation to support artificial cognitive systems on the purpose of motion synthesis and analysis. A sensory-motor praxicon is organized according to some knowledge representation. In the motor pathway, the cognitive process concerns the synthesis (generation) of action sequences based on this praxicon. In the sensory pathway, the cognitive understanding of human activities involves the analysis (parsing) of observed action sequences according to an organized praxicon, a structured lexicon of human actions, previously learned and stored. We empirically show that human interactions have a particular syntax based on the syntax of individual actions. We captured a praxicon, lexicon of human movement, with a number of human interactions such as shake hands, shove, and pass on. In this paper, we extend HAL syntax to consider human interactions between two subjects. Syntax is related to the construction of motion sentences using action words in sequence or in parallel. Morphology concerns the representation of action words in terms of kinetemes and the discovery of a set of essential coordinated actuators for each action. Kinetology, the phonology of human movement, involves the learning of motor primitives through segmentation and symbolization. Our Human Activity Language (HAL) consists of kinetology, morphology, and syntax. This way, we advocate that human motion may be represented as a language. In order to model all important aspects of human motion, we seek a representation that considers these problems in a single framework. Among these aspects, we find the discovery of motor primitives used to build complex motion the representation of complex actions in terms of these primitives the generalization of movement concerning different parameters such as target location, speed, and resistance force the temporal concatenation of motion in a sequence of actions that considers co-articulation and the parallelization of movement in space that allows the performance of different actions at the same time ( e.g. Human motion is a natural phenomenon that involves several different aspects in the representational level.
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