Integration of local features into global shapes: monkey and human FMRI studies.

By Zoe Kourtzi, Andreas S. Tolias, Christian F. Altmann, Mark-Aurel Augath, Nikos K. Logothetis. Neuron, 2003

316 citations recorded by the source corpus.

The integration of local image features into global shapes was investigated in monkeys and humans using fMRI. An adaptation paradigm was used, in which stimulus selectivity was deduced by changes in the course of adaptation of a pattern of randomly oriented elements. Accordingly, we observed stronger activity when orientation changes in the adapting stimulus resulted in a collinear contour than a different random pattern. This selectivity to collinear contours was observed not only in higher visual areas that are implicated in shape processing, but also in early visual areas where selectivity depended on the receptive field size. These findings suggest that unified shape perception in both monkeys and humans involves multiple visual areas that may integrate local elements to global shapes at different spatial scales.

Subfields: Cognitive Neuroscience, Geometry and Topology

View Paper: https://www.semanticscholar.org/paper/dbe2e0029ae75a7e8e0f0a8ff71382ac23c90749

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Cognitive Neuroscience

In Geometry and Topology

Citations in the corpus

Multisensory visual–tactile object related network in humans: insights gained using a novel crossmodal adaptation approach (2009, methodology): “…to test for functional specialization in vision, for example, for convergence of diVerent cues underlying a visual stimulus, shape processing (Kourtzi et al. 2003; Kourtzi and Kanwisher 2000, 2001), face encoding (Winston et al. 2004; Sigala and Rainer 2007), and the integration of color and…”
The human visual cortex. (2004, methodology): “The question of how the unified perception of a global shape (or good Gestalt) emerges through hierarchical processing has been addressed recently by Kourtzi and colleagues (Altmann et al. 2003, Kourtzi et al. 2003b).”
Repetition and the brain: neural models of stimulus-specific effects. (2006, background): “46], object format [36], perceived shape [79], contour completion [ 48 ] and face representation [7,80,81].”
Comparative mapping of higher visual areas in monkeys and humans. (2004, background): “These include similarities in local integration of line elements in V1 and V2 [ 26 ] ,i n the effect of scrambling in V1 [20] (Figure 3c,d), and in the involvement of V2 and V3 in the extraction of 3D-structure from motion (SFM) [14] (Figure 5a,b).”