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Related Experiment Video

Updated: Jun 30, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

Unconscious processing dissociates along categorical lines.

Jorge Almeida¹, Bradford Z Mahon, Ken Nakayama

¹Cognitive Neuropsychology Laboratory, Harvard University, Cambridge, MA 02138, USA. jalmeida@wjh.harvard.edu

Proceedings of the National Academy of Sciences of the United States of America

|September 24, 2008

Summary

This summary is machine-generated.

The dorsal visual stream influences object categorization, particularly for tools. This pathway aids in recognizing manipulable objects, challenging previous assumptions about its role in visual recognition.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Object recognition primarily involves ventral temporal and occipital brain regions.
The dorsal visual pathway's role in object recognition has been historically underestimated.
Dorsal stream regions exhibit biases for tool-related information.

Purpose of the Study:

To investigate the influence of dorsal stream processes on object categorization.
To determine if information processed by the dorsal stream contributes to recognizing manipulable objects.

Main Methods:

Utilized continuous flash suppression (CFS) to render stimuli invisible to the ventral stream.
Employed backward masking (BM) to make stimuli invisible to both ventral and dorsal streams.
Assessed the impact of categorically congruent primes on tool and non-manipulable object categorization.

Main Results:

Continuous flash suppression (CFS) facilitated tool categorization but not non-manipulable object categorization.
Backward masking (BM) facilitated categorization for both tools and non-manipulable objects.
Dorsal stream processing selectively impacts the categorization of manipulable objects.

Conclusions:

Dorsal stream computations are integral to object categorization, especially for manipulable items.
This study refines our understanding of the distinct roles of the ventral and dorsal visual pathways in object recognition.