Figure 10.

Possible effects of vibration on perception of coordinate of an effector (X) and force along that coordinate (F_X). The initial state is shown with the black circle (point 1). Vibration leads to an increase in activity of length sensitive receptors only (point 2). If this signal is interpreted in an unchanged system of coordinates (RC₁), the dot is projected on the original force-length line. Such projections can be performed in different ways (e.g., to points 2a or 2b), and are likely to correspond to perception of higher force. To perceive a change in coordinate (classical VIKI) without a change in force, the system of coordinates would have to shift to RC₂.