02) and longer recovery time (Greenlee, Georgeson, Magnussen, Harris, 1991). When observers are : Différence entre versions

Version du 24 janvier 2018 à 00:03

02) and longer recovery time (Greenlee, Georgeson, Magnussen, Harris, 1991). title= srep30523 When observers are asked to selectively attend to one particular of two spatially superimposed dot fields that differ in motion path, the buy Oleandrin contribution of the attended field for the resulting motion after-effect is stronger than if it were not attended (Lankheet Verstraten, 1995). A further study dealing with motion aftereffects showed that when observers adapt continuously to motion in a ONX 0912 web unique direction, over which short motion pulses of an additional direction are superimposed, the direction of the subsequent motion after-effect alterations if observers are necessary to monitor for the pulses (Alais Blake, 1999). Depending on which in the eight `attentional' motion directions was combined with the adapting motion, modest systematic deviations inside the path with the motion aftereffect ought to follow a sinusoidal pattern oscillating around 180? The authors hypothesized that if consideration boosted theNIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptVision Res. Author manuscript; accessible in PMC 2012 July 05.CarrascoPageneuronal response to an attended motion, then active conditions would yield a largeramplitude sinusoid than passive circumstances. Fig. 16 shows the direction and magnitude on the motion title= pjms.324.8942 aftereffect plotted as a function on the path of attended motion. As predicted, consideration enhanced the deviations inside the motion aftereffect in the path opposite towards the adapting motion. Taken collectively, these benefits imply that FBA selectively increases responses for the attended direction. Equivalent results happen to be shown for superimposed gratings of unique orientations. Selectively attending to a provided colour or orientation increases the extent of the corresponding aftereffects (Liu, Larsson, et al., 2007; Spivey Spirn, 2000). These studies suggest that attending to a feature can result in a stronger response of a neural population tuned to that feature. six.2.1.two. Perceptual functionality: Lots of psychophysical studies have demonstrated that FBA improves detection and enhances overall performance. Early studies showing that foreknowledge about spatial frequency (Davis Graham, 1981; Davis et al., 1983) and path of motion (Ball title= fpsyg.2016.01152 Sekuler, 1981) boost process efficiency support the notion that attention reduces uncertainty about stimulus characteristics. Later work has shown that featurebased cues can affect low-level visual sensitivity. For example, attending selectively to dots moving within a particular direction improves detection of speed increments, relative to when observers simultaneously monitor the superimposed dots moving in the opposite path (Liu, Stevens et al., 2007). Additionally, advance know-how of a stimulus's function improves perception even in the absence of simultaneous distractors. One example is, a critical-band masking paradigm has shown that precueing the orientation of a stimulus improves its detection (Baldassi Verghese, 2005), and an equivalent-noise paradigm has revealed that precueing the approximate direction of moving dots improves direction discrimination (Ling et al., 2009). These studies are constant with the hypothesis that interest boosts sensitivity in the psychophysical channels that ideal represent the target stimulus, and indicate variations inside the way spatial interest and FBA influence orientation-tuning curves (see under, Section six.three.2, comparing effects and mechanisms of spatial interest and FBA). six.two.two. Neurophysio.02) and longer recovery time (Greenlee, Georgeson, Magnussen, Harris, 1991). title= srep30523 When observers are asked to selectively attend to a single of two spatially superimposed dot fields that differ in motion direction, the contribution from the attended field towards the resulting motion after-effect is stronger than if it weren't attended (Lankheet Verstraten, 1995).