A brief though derived from DMs last post from the 21st, in reference to where the actuator and the transducers should be. 'Actuator' is sensor, 'transducer' is buzzy vibrator feedback thing, the thing we will feel, right?
Sensor: In might be useful if participants do NOT know where the sensor is or, alternatively, what method it uses to gather info (EG you put on a pair of overalls and a hat and somewhere in it is hidden the device), so we are not overly pre-interpreting, based on knowledge of the sensor.
Transducer: Following the comment in 2 b/d) about upper body/lower body/body schema/room schema, ankles and feet do seem interesting. What if the the transducer/feedack was on the soles of the feet? An insole slipped into the shoes, maybe. Firstly, the feet, unlike their friends the hands, are not primarily recruited for complex object sensing, in fact we shoe them to avoid or buffer their sensitivity to specifics and generally our downward sensing from the soles of our feet is about grounding and movement (changes in changes...). So that part of our body is not habitually preoccupied with object-processing. Secondly, precisely because the soles deal primarily with locomotion, balance, place etc. adding input here could destabilize a little our habitual way of measuring, pacing, locating. Lift us off our ground a little, creating an interesting sensitivity.
And I think the terms 'sedimented' and 'vanishing' in 2b create vital images.
a