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Overview of the experimental conditions (number of trials in parentheses).
| Presented on screen (50 Hz, 1.5 m away) | Weight attached to object from below |
|---|---|
| No visual feedback (9) | 50 g (3) |
| 100 g (3) | |
| 200 g (3) | |
| Force target tracked by crosshair (9) | 50 g (3) |
| 100 g (3) | |
| 200 g (3) |
The instructions to the subjects were to simply hold the object in a static tripod grasp with as little motion as possible, as in Figure 1
