Change in feature space is not necessary for the flash-lag effect

To achieve perceptual match between a flashed target and a gradually changi ng one, the Bashed target should have the feature value corresponding to th e value to be obtained by the gradually changing target only later. Flashed target should be positioned ahead of the continuously moving one in order to be perceived as aligned (Nijhawan (1994). Nature. 370. 256-257); with co ntinuously changing colour: spatial frequency, pattern entropy or luminance , the flashed target should have feature value which changing target obtain s only later (Sheth, Nijhawan, & Shimojo (2000). Nature Neuroscience, 3, 48 9-495). It was found that Bash-lag effect is present even if the continuous ly accumulating pre- and post-target input consists in spatially and featur ally invariant stimulation. The perceptual precedence of the target in stre am over its synchronous single-Bashed replica may result from perceptual ac celeration where newly arriving visual signals are facilitated by the local ly preceding stimulation. (C) 2001 Elsevier Science Ltd. All rights reserve d.