In 10 human subjects, we measured the accuracy of saccades to remembered locations of targets that were flashed on a 20 x 30 deg random dot display, while they tracked a spot of light that stepped between three vertical locations. The background was either stationary or stepping horizontally in synchrony with vertical motion of the spot of light, a condition that induced a strong illusion of diagonal target motion. Memory-guided saccades were less accurate horizontally, but not vertically, when the background moved compared with when it was stationary. The horizontal component of memory-guided saccades correlated better with the position of the background when the target was flashed than with the position of the background at the end of the memory period. We conclude that the visual illusion corrupted the working memory of target location, but had a lesser effect on the estimate of gaze at the end of the memory period, which seemed to depend more on extraretinal signals.
|State||Published - May 1998|
Bibliographical noteFunding Information:
Acknowledgements--This work was supportedb y USPHS grant EY06717 from the NationalE ye Instituteo f the NationalI nstitutes of Health;t heO fficeo f Researchan dD evelopmenMt,e dicalR esearch Service,D epartmenotf VeteransA ffairs;and the EvenorA rmington Fund (to Dr Leigh).
- Visual illusion