Four ways of (mis-)conceiving embodiment in tool use

A broader conception of the user’s perceptual, cognitive, and motor capabilities considers tools as body extensions. By identifying specific tool-related motor-grounded mechanisms, the embodied approach assumes that this “extensional phenomenon” takes place not only at a behavioral level but also at a psychological level. At least four ways of conceiving embodiment in tool use have been offered in relation to the concepts of incorporation, perception, knowledge, and observation. Nevertheless, the validity of these conceptions has been rarely, if not never, assessed. In this article, we attempt to fill this gap by discussing each of these conceptions in turn, with the aim of determining whether it is justified to consider tools as detached objects of a special sort in embodied terms. We argue that tool incorporation is made possible by “distalization”, that is, an embodied mechanism specific to tool use. Nevertheless, there is neither empirical nor theoretical support for the hypothesis that specific tool-related embodied mechanisms are involved in perception, knowledge, and observation. In broad terms, there is a tendency in the literature to overinterpret tool use as an embodied phenomenon at a psychological level. Inevitably, this limitation leads us to under-intellectualize the underlying cognitive processes and, as a result, it prevents us from understanding the technical-reasoning skills that allow humans to transform dramatically the physical world.