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Early recurrent feedback facilitates visual object recognition under challenging conditions
Dean Wyatte1, David J Jilk2, Randall C O'Reilly1
1Department of Psychology and Neuroscience, University of Colorado Boulder Boulder, CO, USA.
Frontiers in Psychology
|July 30, 2014
Summary
New research reveals that feedback signals in visual object recognition originate earlier than previously thought, supporting feature grouping and identification even with unclear or occluded objects.
Area of Science:
- Neuroscience
- Cognitive Science
- Visual Perception
Background:
- Traditional models posit a feedforward visual object recognition pathway from retina to inferotemporal cortex.
- Feedback from frontoparietal areas supports attention to salient features.
- The role and origin of early feedback mechanisms remain incompletely understood.
Purpose of the Study:
- To review evidence for feedback signals originating within extrastriate cortex during early visual processing.
- To explore the functional role of these early feedback signals, distinct from attentional feedback.
- To expand current models of visual object recognition by incorporating early feedback mechanisms.
Main Methods:
- Review of existing neuroscientific literature and experimental findings on visual object recognition.
- Analysis of temporal dynamics and functional dissociations of feedback pathways.
- Synthesis of evidence regarding the role of extrastriate feedback in object identification.
Main Results:
- Evidence suggests feedback signals originate in extrastriate regions concurrent with feedforward processing.
- These early feedback signals are temporally distinct from attentional feedback and support grouping and feature completion.
- Local feedback is crucial for object identification in noisy or ambiguous visual conditions.
Conclusions:
- Early feedback originating in extrastriate cortex plays a critical role in object recognition.
- This early feedback functions independently of later attentional feedback.
- A dual role for descending feedback projections, encompassing both early and late processes, is proposed.
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