Abstract
Eye-hand coordination of an infant is observed during the early months of their development. Hand regard, which is an example of this coordination, occurs at about 2 months. It is considered that after experiencing hand regard, an infant may recognize their own hands. However, it is unknown how an infant recognizes their hands through hand regard. Accordingly, the process by which an infant recognizes their hands and distinguishes between their hands and other objects was simulated. A simple neural network was trained with a modified real-time recurrent learning (RTRL) algorithm to deal with time-varying input and output during hand regard. The simulation results show that information about recognition of the modeled hands of an infant is stored in cell assemblies, which were self-organized. Cell assemblies appear during the phase of U-shaped developments of hand regard, and the configuration of the cell assemblies changes with each U-shaped development. Furthermore, movements like general movements (GMs) appear during the phase of U-shaped developments of hand regard.
Highlights
Infants engage in long periods of playful self-exploration and pick up information that uniquely specifies their own body in action
In order to create the simulation model for learning hand regard, it is necessary to know what kind of inputs an infant receives and how they process these inputs and generate the motor command to move their hands into their field of view
Cell Assemblies Appearing During the Phase of U-Shaped Development
Summary
Infants engage in long periods of playful self-exploration and pick up information that uniquely specifies their own body in action. A simple model for the learning of hand regard is formulated With this model, the process by which an infant recognizes their hands and distinguishes between their hands and other objects is simulated. The integration of visual feedback, corollary discharge and proprioceptive information were not incorporated in this model; the recognition of infant hands was not studied. The relationship between hand-regard behavior and hand recognition, which is obtained by the integration of the visual feedback, corollary discharge and proprioceptive information, has been hardly studied. Since some kind of relationship is expected, the two senses proposed by Gallagher are incorporated in the present model This incorporation makes it possible to integrate the visual feedback, corollary discharge and proprioceptive information. It is tested whether integrating these inputs enables hand recognition
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