|
Yeshurun, Y. & Carrasco, M. (1999). Spatial attention improves performance
in spatial resolution tasks. Vision Research, 39: 293-306
Abstract
This study used peripheral precueing to explore the effect of covert transient
attention on performance in spatial resolution tasks. Experiments 1 (Landolt-square)
and 2 (Ôbroken-lineÕ) measured gap resolution and Experiment 3 measured
vernier resolution. In all three tasks the target was presented alone
in a large number of possible locations, ranging from 1.5Ð6¡ of eccentricity
in the vertical or horizontal axes. The precue indicated the target location
but did not convey information regarding the correct response. Performance
decreased as the gap size or the vernier offset size decreased and as
target eccentricity increased. Precueing improved performance in terms
of RT and accuracy in all three tasks; the eccentricity effect decreased
in the cued trials of the gap resolution tasks. These findings support
the idea that the performance improvement at attended locations results,
to some extent, from an enhanced spatial resolution at the cued location,
and not just from distractor exclusion, diminished uncertainty, or decisional
factors.
|