An apparatus (2) for use in diagnosing and/or treating a neurological disorderisdisclosed. The apparatus comprises a sensor device (4) designed to resemble apen toprovide a first signal containing first data representing a force applied byat least onefinger of the subject, an integrated writable surface (10) to (i) provide atleast onesecond signal containing second data representing a position of the sensordevice (4)relative to the writable surface (10) and/or (ii) provide at least one thirdsignal containingthird data representing an engaging force of the sensor device on the writablesurface,and a camera (20) to provide at least one fourth signal containing fourth datarepresenting a position of at least one part of an arm of the subject holdingthe sensordevice (4).
