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Meaning/Words/Language/Frith: the problem of the meaning of words is a version of the problem of movements and goals.
Movement: E.g. From the movement of walking we do not see whether someone wants to go to the next bakery or to Patagonia.
Definition forward problem: what happens when I exert certain forces on this system: This problem is solvable.
Inverse problem: when this movement happens, what is the intention, what forces does it result from? An ambiguity remains, there are several solutions.
Brain/Movement/Frith: we do not know exactly how the brain defines the "best solution" for movements.
Wie unser Gehirn die Welt erschafft Heidelberg 2013