Visual Exploration and Object Recognition by Lattice Deformation
Open Access
- 27 July 2011
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 6 (7), e22831
- https://doi.org/10.1371/journal.pone.0022831
Abstract
Mechanisms of explicit object recognition are often difficult to investigate and require stimuli with controlled features whose expression can be manipulated in a precise quantitative fashion. Here, we developed a novel method (called “Dots”), for generating visual stimuli, which is based on the progressive deformation of a regular lattice of dots, driven by local contour information from images of objects. By applying progressively larger deformation to the lattice, the latter conveys progressively more information about the target object. Stimuli generated with the presented method enable a precise control of object-related information content while preserving low-level image statistics, globally, and affecting them only little, locally. We show that such stimuli are useful for investigating object recognition under a naturalistic setting – free visual exploration – enabling a clear dissociation between object detection and explicit recognition. Using the introduced stimuli, we show that top-down modulation induced by previous exposure to target objects can greatly influence perceptual decisions, lowering perceptual thresholds not only for object recognition but also for object detection (visual hysteresis). Visual hysteresis is target-specific, its expression and magnitude depending on the identity of individual objects. Relying on the particular features of dot stimuli and on eye-tracking measurements, we further demonstrate that top-down processes guide visual exploration, controlling how visual information is integrated by successive fixations. Prior knowledge about objects can guide saccades/fixations to sample locations that are supposed to be highly informative, even when the actual information is missing from those locations in the stimulus. The duration of individual fixations is modulated by the novelty and difficulty of the stimulus, likely reflecting cognitive demand.Keywords
This publication has 67 references indexed in Scilit:
- Face Inversion Reduces the Persistence of Global Form and Its Neural CorrelatesPLOS ONE, 2011
- An adaptive algorithm for fixation, saccade, and glissade detection in eyetracking dataBehavior Research Methods, 2010
- Distributed Fading Memory for Stimulus Properties in the Primary Visual CortexPLoS Biology, 2009
- Bayesian estimation of the shape skeletonProceedings of the National Academy of Sciences, 2006
- Mechanisms of Top-Down Facilitation in Perception of Visual Objects Studied by fMRICerebral Cortex, 2006
- Uncertainty and Invariance in the Human Visual CortexJournal of Neurophysiology, 2006
- What causes non-monotonic tuning of fMRI response to noisy images?Current Biology, 2002
- Grouping by Proximity and Multistability in Dot Lattices: A Quantitative Gestalt TheoryPsychological Science, 1995
- The perceptual organization of dot latticesPsychonomic Bulletin & Review, 1994
- Inferences about eye movement control from the perceptual span in readingPerception & Psychophysics, 1986