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Related Experiment Video

Updated: Jun 9, 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

Material discrimination relies on context-dependent active sensing strategies.

Ryu Nomachi^1,2, Hideki Tamura^1,3,4, Kevin A Helgeland^1,5,6

¹Department of Computer Science and Engineering, Toyohashi University of Technology, Toyohashi, Japan.

Journal of Vision

|June 8, 2026

Summary

Humans actively explore objects using head and hand movements to better distinguish challenging materials like metal and glass. Increased exploration, especially viewpoint changes and object manipulation, improves material discrimination performance.

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Area of Science:

Visual perception
Cognitive psychology
Human-computer interaction

Background:

Material perception is often studied passively, limiting understanding of active sampling.
Everyday vision involves natural head and hand movements for cue acquisition.
The role of exploratory actions in material discrimination remains unclear.

Purpose of the Study:

To investigate if viewpoint changes and object manipulations aid material discrimination.
To examine how active exploration resolves ambiguities in materials like metal versus glass.
To differentiate the contributions of head- and hand-based movements in material perception.

Main Methods:

Utilized immersive virtual reality for controlled experiments.
Measured exploratory movements (head and hand) during material discrimination tasks.
Independently manipulated head- and hand-based motions to assess their specific effects.

Main Results:

Observers increased exploratory movements for ambiguous materials.
Greater exploration correlated with improved material discrimination performance.
Viewpoint changes were more effective for multi-object comparison, while object manipulation excelled for single targets.

Conclusions:

Material discrimination relies on active, context-dependent exploration, not passive viewing.
Head and hand movements are flexibly employed to gather diagnostic visual information.
Individual differences in sampling strategies influence discrimination sensitivity.