Since humans direct their visual attention by means of eye movements, a device which monitors eye movements should be a natural “pick” device for selecting objects visually present on a monitor. The results from an experimental investigation of an eye tracker as a computer input device are presented. Three different methods were used to select the object looked at; these were a button press, prolonged fixation or “dwell” and an on screen select button. The results show that an eye tracker can be used as a fast selection device providing that the target size is not too small. If the targets are small speed declines and errors increase rapidly.

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Lack of directional adaptation to prism-rearrangement after wheelchair conveyance might be attributed to motivational deficiency instead of inappropriate information from the motor-sensory feedback loop. However, even when Ss must propel and guide themselves in the chair by manipulating the wheels, they fail to adapt despite their motivation.

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