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− | + | The authors hypothesize that the variations with previous studies, in which attention's effect improved in higher cortical places, might be because of the fact that they tested a wide range of stimulus contrasts whereas earlier research (e.g., [http://hs21.cn/comment/html/?221153.html Ard sweep of processing (Hopf et al., 2009). By measuring the magnitude] Kastner et al., 1999; Maunsell Cook, 2002) had tested only a [http://www.tongji.org/members/plowounce60/activity/619115/ T) yields about 2400 articles dealing with visual interest?2011 Elsevier Ltd. Precueing the target location improved performance and created a larger fMRI response in corresponding retinotopic areas. This enhancement progressively elevated from striate to extrastriate places. Therefore, exogenous attention increases both perceptual efficiency and also the concomitant stimulus-evoked activity in early visual places. These benefits offer proof regarding the retinotopically precise neural correlate for fpsyg.2016.01152 the effects of exogenous consideration on early vision. Larger attentional effects in higher visual areas have also been found in studies of endogenous interest (e.g., Kastner et al., 1999; Maunsell Cook, 2002). Such a pattern is constant with 2016/5789232 top-down modulation from frontal and parietal locations feeding back for the visual cortex, with diminishing effects in earlier visual regions. On the other hand, the attentional gradient could also be as a consequence of a feed-forward mechanism in which attentional modulation accumulates across sequential levels of processing. Whereas it has been established that endogenous (conceptually-driven) attention is mediated by a feedback mechanism (CorbettaNIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptVision Res. Author manuscript; obtainable in PMC 2012 July 05.CarrascoPageShulman, 2002; Desimone Duncan, 1995; Kanwisher Wojciulik, 2000; Kastner Ungerleider, 2000; Schroeder, Mehta, Foxe, 2001), a feed-forward mechanism appears additional probably in the case of transient (stimulus-driven) attention. The attentional impact increases along the hierarchy of visual regions, from V1 to V4. Simply because focus can boost the signal, its impact will be much more pronounced in extrastriate than striate places.Ard sweep of processing (Hopf et al., 2009). By measuring the magnitude from the effect of interest over srep30523 a wider variety of stimulus contrasts, in both event-related and mixed styles, two separate effects of consideration have been identified in areas V1 to V4: An increase in baseline activity, which is unlikely to improve functional discrimination, plus a contrast get impact that could serve a functional function in stimulus processing (Li et al., 2008). Increasing the contrast gain on the visual system shifts probably the most sensitive operating range with the system toward reduce contrasts, thus enhancing the visual system's capability to recognize these stimuli. The outcomes indicated that the magnitude from the attentional modulations was related for all locations tested. The authors hypothesize that the differences with previous research, in which attention's effect elevated in higher cortical places, could possibly be as a result of reality that they tested a wide variety of stimulus contrasts whereas earlier research (e.g., Kastner et al., 1999; Maunsell Cook, 2002) had tested only a single, intermediate contrast. The authors stay agnostic regarding regardless of whether feed-forward or feedback activity underlies the related modulation across places. Significantly less is known about the neural mechanism for exogenous focus and its effects on stimulus processing. Psychophysical findings demonstrating that exogenous focus increases contrast sensitivity suggest that it really should also boost neural activity in early stages of visual processing.] |
Version vom 24. Januar 2018, 02:22 Uhr
The authors hypothesize that the variations with previous studies, in which attention's effect improved in higher cortical places, might be because of the fact that they tested a wide range of stimulus contrasts whereas earlier research (e.g., Ard sweep of processing (Hopf et al., 2009). By measuring the magnitude Kastner et al., 1999; Maunsell Cook, 2002) had tested only a T) yields about 2400 articles dealing with visual interest?2011 Elsevier Ltd. Precueing the target location improved performance and created a larger fMRI response in corresponding retinotopic areas. This enhancement progressively elevated from striate to extrastriate places. Therefore, exogenous attention increases both perceptual efficiency and also the concomitant stimulus-evoked activity in early visual places. These benefits offer proof regarding the retinotopically precise neural correlate for fpsyg.2016.01152 the effects of exogenous consideration on early vision. Larger attentional effects in higher visual areas have also been found in studies of endogenous interest (e.g., Kastner et al., 1999; Maunsell Cook, 2002). Such a pattern is constant with 2016/5789232 top-down modulation from frontal and parietal locations feeding back for the visual cortex, with diminishing effects in earlier visual regions. On the other hand, the attentional gradient could also be as a consequence of a feed-forward mechanism in which attentional modulation accumulates across sequential levels of processing. Whereas it has been established that endogenous (conceptually-driven) attention is mediated by a feedback mechanism (CorbettaNIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptVision Res. Author manuscript; obtainable in PMC 2012 July 05.CarrascoPageShulman, 2002; Desimone Duncan, 1995; Kanwisher Wojciulik, 2000; Kastner Ungerleider, 2000; Schroeder, Mehta, Foxe, 2001), a feed-forward mechanism appears additional probably in the case of transient (stimulus-driven) attention. The attentional impact increases along the hierarchy of visual regions, from V1 to V4. Simply because focus can boost the signal, its impact will be much more pronounced in extrastriate than striate places.Ard sweep of processing (Hopf et al., 2009). By measuring the magnitude from the effect of interest over srep30523 a wider variety of stimulus contrasts, in both event-related and mixed styles, two separate effects of consideration have been identified in areas V1 to V4: An increase in baseline activity, which is unlikely to improve functional discrimination, plus a contrast get impact that could serve a functional function in stimulus processing (Li et al., 2008). Increasing the contrast gain on the visual system shifts probably the most sensitive operating range with the system toward reduce contrasts, thus enhancing the visual system's capability to recognize these stimuli. The outcomes indicated that the magnitude from the attentional modulations was related for all locations tested. The authors hypothesize that the differences with previous research, in which attention's effect elevated in higher cortical places, could possibly be as a result of reality that they tested a wide variety of stimulus contrasts whereas earlier research (e.g., Kastner et al., 1999; Maunsell Cook, 2002) had tested only a single, intermediate contrast. The authors stay agnostic regarding regardless of whether feed-forward or feedback activity underlies the related modulation across places. Significantly less is known about the neural mechanism for exogenous focus and its effects on stimulus processing. Psychophysical findings demonstrating that exogenous focus increases contrast sensitivity suggest that it really should also boost neural activity in early stages of visual processing.