Abstract
Neuroprosthetics refer to prosthetic devices designed according to neuroscientific principles and interfacing directly with the nervous system. We propose a fundamental distinction between receptor prosthetics and somatic prosthetics. Receptor prosthetics involve substituting or augmenting the signals that the peripheral end-organ sends to the brain. In the ideal case, this substitution is perfectly transparent, so no novel learning or plastic change of neural processing is required. In contrast, somatic prosthetics will not just send new or substitute signals to the brain, but relies on plastic adjustments to the brain to use the novel signal in a functional way. The former does not involve any change in the representation of the body, but the latter may force the brain to change fundamental features of body representation. The continuum from receptor prosthetics to somatic prosthetics may provide a useful way of thinking about the hierarchy of the body representation extending from local receptor information processing (e.g. skin, muscle and joint) to the coherent representation of the body that apparently underlies the sense of ‘self’.
The first part of our chapter focuses on representation and the second on process. We first describe the different representations within the somatosensory system, and we discuss evidence for the existence of the integrated body representation. An important concept here will be to identify any aspects of body representation which cannot simply be explained by summation of local receptor information processing. Second, we will focus on the processes that can lead to the change in the body representation. These form the crucial element of somatic prosthetics. We argue for the existence of two different mechanisms that can modify the body representation at different timescales. Moreover, thinking about the different plastic processes that the CNS uses to respond to changing inputs may be a useful way to clarify how the body is represented in the brain.
In the final section we use these ideas to consider possible differences in the way that prosthetic control produces changes in body representations.
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Acknowledgements
Patrick Haggard was supported by EU FP7 Project VERE (WP1), by an ESRC Professorial Fellowship and by ERC Advanced Grant HUMVOL. Nobuhiro Hagura is supported by Marie Curie International Incoming Fellowships and by the Japanese Society for the Promotion of Sciences (JSPS).
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Hagura, N., Haggard, P. (2015). Body Representation and Neuroprosthetics. In: Kansaku, K., Cohen, L., Birbaumer, N. (eds) Clinical Systems Neuroscience. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55037-2_10
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