Figure 1. Mirror apparatus from the experimenter’s point of view.

The scale below the diagram indicates distance from the mirror towards the participant’s right. Participants viewed their left hand on both the left and right of their midline (by virtue of a mirror placed at the midline facing the left arm, and obscuring the right arm). The left hand was placed 12cm from the mirror. The position of the participant’s hidden right hand was either congruent with the visual image (12cm to the participant’s right with respect to the mirror), or else was put into spatial conflict in the azimuthal dimension with the illusory visual image (7cm or 17cm to the participant’s right with respect to the mirror). The location of the left hand, and all of the starting locations of the right hand were 23cm in front of the participant’s body. Participants reached toward the target (12cm to the right of the mirror, and 48cm in front of the participant’s body – indicated by the visible arrow above it). Lateral terminal errors were measured. Errors to the participant’s right (left) with respect to the target were scored as positive (negative).