Erratum to: Functional Brain Organization of Global and Local Visual Perception: An Event-Related Potentials Study

Abstract

Adult subjects were asked to recognize a hierarchical visual stimulus (a letter) while their attention was drawn to either the global or local level of the stimulus. Event related potentials (ERP) and behavioral indices (reaction time and percentage of correct responses) were measured. An analysis of behavioral indices showed the global level precedence effect, i.e. the increase in a small letter recognition time when this letter is a part of incongruent stimulus. An analysis of ERP components showed level related (global vs. local) dif ferences in the timing and topography of the brain organization of perceptual processing and regulatory mechanisms of attention. Visual recognition at the local level was accompanied by (1) stronger activation of the visual associative areas (Pz and T 6) at the stage of sensory features analysis (P1 ERP component), (2) involvement mainly of inferior temporal cortices of the right hemisphere (T 6) at the stage of sensory catego rization (P2 ERP component), and (3) involvement of prefrontal cortex of the right hemisphere at the stage of selection of the relevant features of the target (N2 ERP component). Visual recognition at the global level was accompanied by (1) pronounced involvement of mechanisms of early sensory selection (N1 ERP com ponent), (2) prevailing activation of parietal cortex of the right hemisphere (P 4) at the stage of sensory cate gorization (P2 ERP component) as well as at the stage of the target stimulus identification (P3 ERP compo nent). We suggested that perception of the hierarchical stimulus at the global level is related primarily to the analysis of its spatial features in the dorsal visual system whereas the perception at the local level primarily involves an analysis of the object related features in the ventral visual system.

Meditation Increases the Depth of Information Processing and Improves the Allocation of Attention in Space

“…This supports previous findings of global target selection in the P3 time period (Dalrymple et al, 2009; Machinskaia et al, 2010). …”

“…P3 amplitude was higher for targets at the global level than for targets at the local in both groups [ F (1,14) = 6.33, p < 0.05, mean global = 4.64 μV, mean local = 4.19 μV, see Figures 6 B,C]. This supports previous findings of global target selection in the P3 time period (Dalrymple et al, 2009 ; Machinskaia et al, 2010 ).…”

“…Similarly, previous work has shown that responses to global targets are enhanced during the time period of the P3 over centroparietal electrodes, suggesting that global target information is selected at the level of the P3 (Han et al, 2001 ; Dalrymple et al, 2009 ; Machinskaia et al, 2010 ). Our results replicate this finding in both the meditation and the control group.…”

“…However, meditators already showed an effect of global target selection about 150 ms earlier during the N1 time period over occipito-temporal electrodes, which was absent in controls. Global target selection during the N1 time period has been previously reported, but mostly under conditions in which the to-be-attended level is known in advance (directed attention condition), e.g., when subjects are asked to detect a target exclusively at the global level while ignoring the local elements (Proverbio et al, 1998 ; Machinskaia et al, 2010 ). This earlier selection is thought to be related to top–down gain control mechanisms that boost global level information.…”

Coding Method of Visual Perception Reconstruction Based on Curve Fitting and Energy Function

“…Many years it has been in the field of visual perception feature analysis theory proposed by Marr and the overall priority theory proposed by Navon play a dominant role, Marr's feature analysis theory advocates that the process of visual perception carry out from the local natures to the whole natures, the local geometry nature is firstly perceived [1]; At the same time, Navon's overall priority theory advocates that the process of visual perception carry out from a wide range of natures to the local natures, a large range of topological natures are firstly perceived [2]. At this stage, more and more evidence shows that human perceiving the overall natures have priority in visual perceptual processing [3]. For overall priority theory, the most famous principle is the perceptual organization principle proposed by Gestalt, which includes adjacency ratio, similarity ratio, closure ratio, covariant ratio [4].…”