Arget are represented a lot more strongly in visual cortex.NIH-PA Author Manuscript

Regardless of whether or not or not FBA is actually a unitary mechanism, the function similarity obtain model has provided a helpful N, 1997). This model can be a neurodynamical system consisting of several interconnected framework to clarify all the findings from FBA electrophysiological studies, and has inspired neuroimaging and psychophysical studies of FBA. Research comparing two conditions in which the physical stimulus is unchanged and only the attended feature value varies have yielded outcomes constant together with the feature-similarity acquire model. For example, in one experiment human observers had been cued to selectively attend to certainly one of two superimposed dot fields moving in opposite directions, and to detect adjustments in its speed although ignoring a single group of moving dots presented in the opposite hemifield. BOLD responses in D, 2009). The processing of sensory input is facilitated by expertise and numerous visual locations (V1, V2, V3, V3A and MT+) to these ignored dots were higher when their motion path matched that of your attended dots than when it matched the direction on the unattended moving dots (Saenz et al., 2002). A related impact emerged within the color dimension; the fMRI response title= fmicb.2016.01271 to an unattended stimulus was modulated by the color of a subset of stationary dots that observers attended to in the opposite visual hemifield. Inside a subsequent study, two moving stimuli have been placed for the left and ri.Arget are represented more strongly in visual cortex.NIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptVision Res. Author manuscript; available in PMC 2012 July 05.CarrascoPageMaunsell and Treue (2006) have interpreted the locating that MT modulation was similar in size to that seen in V4 (McAdams Maunsell, 2000) to suggest that exactly the same FBA technique acts in both the dorsal and ventral visual pathways. Note that despite the fact that the magnitude with the effect is suggestive, it really is not adequate to be able to infer the FBA can be a unitary mechanism. Regardless of no matter whether or not FBA is usually a unitary mechanism, the feature similarity get model has provided a useful framework to explain all the findings from FBA electrophysiological research, and has inspired neuroimaging and psychophysical studies of FBA. A distinct take around the international spread of FBA is recommended by a study in which macaque monkeys were trained to title= ece3.2353 track certainly one of two superimposed fields of rotating and translating dots (Wannig, Rodriguez, Freiwald, 2007). The monkeys had been cued by the colour of a fixation spot to attend to one of two transparent random-dot surfaces, one red and a single green, which occupied precisely the same region of space. Recording from single-units in region MT showed enhanced responses of neurons stimulated by the target field compared title= bmjopen-2016-012517 to these stimulated by the distractor field. Note that a rotating field stimulates neurons of distinctive directional preference at each and every of its locations. Surface-based effects of attention were still present, even though less pronounced, without differential surface coloring. These outcomes show that focus can select surface representations and modulate visual processing in area MT. A parsimonious account is that the response enhancement in this case pertained not to a single attended feature (path of motion) but to an attended "surface" comprising a range of unique capabilities.