Orientation specificity predicted for vernier, but not stereoacuity training.

<p>A) The simplest rule that can be learned to perform the vernier acuity task is a simple discriminant function. A participant trained with the stimuli in a vertical orientation would thus learn a discriminant to divide the space into “left” and “right” answers. This rule is of little use when the stimuli are rotated by 90° as the critical comparison is now related to “above” or “below”. B) Conversely, essentially the same rule can be used regardless of stimulus orientation in the stereoacuity task (i.e. the discriminant that divides “front” from “back” does not depend on whether the stimuli are oriented vertically or horizontally.<i>*Note–the stimuli in the current experiment were flat squares– 3D boxes are presented above for demonstration purposes</i>.