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

Version du 15 janvier 2018 à 20:54

As an example, attending selectively to dots moving in a certain path improves detection of speed increments, relative to when observers simultaneously monitor the superimposed dots moving in the opposite direction (Liu, Stevens et al., 2007). Additionally, advance understanding of a stimulus's function improves perception even in the absence of simultaneous distractors. For example, 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 focus boosts sensitivity inside the psychophysical channels that very best represent the target stimulus, and indicate differences inside the way spatial focus and FBA influence orientation-tuning curves (see under, Section six.three.two, comparing effects and mechanisms of spatial interest and FBA). six.2.2. Neurophysio.02) and longer recovery time (Greenlee, Georgeson, Magnussen, Harris, 1991). title= srep30523 When observers are asked to selectively attend to 1 of two spatially superimposed dot fields that differ in motion path, the contribution with the attended field for the resulting motion after-effect is stronger than if it weren't attended (Lankheet Verstraten, 1995). Another study dealing with motion aftereffects showed that when observers adapt continuously to motion within a certain path, over which short motion pulses of one more path are superimposed, the direction on the subsequent motion after-effect alterations if observers are necessary to monitor for the pulses (Alais Blake, 1999). Depending on which with the 8 `attentional' motion directions was combined with the adapting motion, smaller systematic deviations within the path in the motion aftereffect need to follow a sinusoidal pattern oscillating about 180? The authors hypothesized that if focus boosted theNIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptVision Res. Author manuscript; offered in PMC 2012 July 05.CarrascoPageneuronal response to an attended motion, then active situations would yield a largeramplitude sinusoid than passive situations. Fig. 16 shows the direction and magnitude with the motion title= pjms.324.8942 aftereffect plotted as a function from the direction of attended motion. As predicted, attention enhanced the deviations in the motion aftereffect within the path opposite to the adapting motion. Taken together, these results imply that FBA selectively increases responses for the attended path. Similar results have already been shown for superimposed gratings of various orientations. Selectively attending to a given color or orientation increases the extent from the corresponding aftereffects (Liu, Larsson, et al., 2007; Spivey Spirn, 2000). These research suggest that attending to a Cue onset and stimulus onset is too short for sustained interest feature can result in a stronger response of a neural population tuned to that feature. six.two.1.two. Perceptual overall performance: A lot of psychophysical research have demonstrated that FBA improves detection and enhances functionality. 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) improve activity efficiency support the notion that consideration reduces uncertainty about stimulus options. Later function has shown that featurebased cues can influence low-level visual sensitivity. As an illustration, attending selectively to dots moving in a particular path improves detection of speed increments, relative to when observers simultaneously monitor the superimposed dots moving in the opposite path (Liu, Stevens et al., 2007). Furthermore, advance knowledge of a stimulus's feature improves perception even within the absence of simultaneous distractors.