Figure 8.3 shows their results. This close correspondence between the angle of rotation of the two drawings and the participants’ reaction time strongly (ดูไม่ออก) suggests that they performed the task by mental rotation of one drawing. Moreover, the time it took participants to come to a decision was the same for rotations in the picture plane (ดูไม่ออก) and in depth. This suggests they were mentally rotating three-dimensional images, …(ดูไม่ออก) just the two-dimensional drawings. Had participants been rotating only the latter, their performance would have differed as a function of whether the rotation was in the picture plane or in depth.