Behavioral performance for all conditions of experiment 2 (luminance).

<p>‘Hits’: Percentage of correct detections. ‘FA rate’: Percentage of false alarms (indications of change when no change was present). ‘d′’: Measure of perceptual sensitivity. Log β: Measure of response bias towards either a change or no-change response.</p

Behavioral performance for all conditions of experiment 1 (orientation).

<p>‘Hits’: Percentage of correct detections. ‘FA rate’: Percentage of false alarms (indications of change when no change was present). ‘d′’: Measure of perceptual sensitivity. Log β: Measure of response bias towards either a change or no-change response.</p

Visual hemifield differences in grasping and pointing performance.

<p>Differences in sensitivity between grasping and pointing are prominent when the stimulus is shown in the right visual field, but not when the stimulus appears in the left visual field.</p

Experimental paradigm.

<p>(A) Stimulus display used in experiment 1 (orientation) and 2 (luminance). A fixation spot was followed by the appearance of a bar that signaled the go-cue for the action to be executed (by instruction) and which could be either rotated slightly (left, experiment 1) or differ in luminance (right, experiment 2) from the subsequent second bar. A brief fixation period (100 ms) was present between the first and second bar presentation. Subjects responded by key-press after execution of the action. (B) Timeline representation of the paradigm. The top plot represents the grand mean average movement (distance to origin) for either grasping (black) or pointing (gray).</p

Grasping angle preshaping.

<p>Mean orientation of the thumb-index vector, as a function of target bar orientation (45 or −45 deg) and experiment (orientation/luminance) in the grasping condition. The horizontal axis represents the percent movement completed (0–100%), where 0% is movement onset and 100% is the point where the bar on screen is grasped. Error bars represent the standard error (SE).</p

Effects of training.

<p>Separate analyses were performed on the first (block 1–2) and second half (block 3–4) of the first (orientation change) experiment. Differences in sensitivity due grasping or pointing preparation become apparent only in the second half of the orientation experiment (1).</p

Kinematic data example.

<p>Exemplar data from grasping and pointing from a single subject, for a single bar position. (A) Velocity profile is taken from the wrist position. The first peak in velocity reflects the initial transport to the screen, whereas the second peak is caused by the retraction from the screen after the grasping/pointing action to the rest position. (B) Height profile is extracted from the thumb and index positions. Here, maximum height is reached when the subjects points to/grasps the bar on screen. Differences in thumb-index height in the grasping condition reflect the grasping aperture.</p

Reaction time data_ Exp2_Fig5_Schutte_etal

Data corresponds to Experiment 2 and Figure

Probabilistic selection task data_ Exp1A_Fig2a_Fig3a

Data corresponds to experiment 1A and Figure 2A/3A

Probabilistic selection task data_ Exp1B_Fig2b_Fig3b_Schutte_etal

Data corresponds to Experiment 1B and Figure 2B/3B