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Cross-Modal Multivariate Pattern Analysis

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Multi-inducer grouping for curve completion: Perceptual and computational exploration.

Nir-Cohen Gal^1,2, Arad Boaz^3,2, Ben-Shahar Ohad^3,2

¹Department of Brain and Cognitive Sciences, Ben Gurion University of the Negev, Be'er-Sheva, Israel.

Journal of Vision

|August 17, 2017

Summary

The visual system uses contour completion to perceive whole objects, even with gaps. This study reveals how proximity, orientation, and curvature interact to group visual elements, improving object recognition.

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Area of Science:

Cognitive Science
Visual Perception
Computational Neuroscience

Background:

Human visual system efficiently recognizes objects and interprets scenes, including occluded or fragmented ones.
Contour completion, a constructive process, enables perception of whole objects across gaps by grouping inducers.
Previous research focused on 'good continuation' for grouping, leaving multi-inducer interactions and other factors unexplored.

Purpose of the Study:

To investigate how the visual system groups inducers in multi-inducer scenes.
To explore the interaction of contour completion with relative proximity, orientation, and curvature.
To address limitations of previous grouping theories in complex naturalistic stimuli.

Main Methods:

Employed the dot localization paradigm to indirectly infer inducer grouping.
Analyzed the three-dimensional response function based on proximity, orientation, and curvature.
Developed a parametric model to predict perceptual grouping responses.

Main Results:

Identified an opponency relationship between relative proximity and orientation in visual grouping.
The proposed model accurately predicts observer responses in multi-inducer scenes.
Discrepancies were noted between experimental results and classical relatability theory predictions.

Conclusions:

Visual grouping in complex scenes involves interactions between multiple factors beyond good continuation.
Proximity and orientation exhibit an opponency, influencing contour completion.
The findings offer a refined understanding of visual object perception and grouping mechanisms.