Manual anchoring biases in slant estimation affect matches even for near surfaces

Psychonomic Bulletin & Review
Dennis M ShafferFrank H Durgin

Abstract

People verbally overestimate hill slant by ~15°-25°, whereas manual estimates (e.g., palm board measures) are thought to be more accurate. The relative accuracy of palm boards has contributed to the widely cited theoretical claim that they tap into an accurate, but unconscious, motor representation of locomotor space. Recently, it was shown that a bias that stems from anchoring the hand at horizontal prior to the estimate can quantitatively account for the difference between manual and verbal estimates of hill slant. The present work extends this observation to manual estimates of near-surface slant, to test whether the bias derives from manual or visual uncertainty. As with far surfaces, strong manual anchoring effects were obtained for a large range of near-surface slants, including 45°. Moreover, correlations between participants' manual and verbal estimates further support the conclusion that both measures are based on the same visual representation.

References

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Mar 26, 2014·Journal of Experimental Psychology. Human Perception and Performance·Dennis M ShafferFrank H Durgin
Jun 15, 2014·Attention, Perception & Psychophysics·Heiko HechtMariagrace Flint

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Citations

Nov 26, 2015·Attention, Perception & Psychophysics·Dennis M ShafferPhil Graves
Nov 12, 2015·Attention, Perception & Psychophysics·Dennis M ShafferEric McManama
Dec 10, 2016·Attention, Perception & Psychophysics·Dennis M Shaffer, Ally Taylor
Jul 25, 2018·Attention, Perception & Psychophysics·Dennis M ShafferEchoe Smith
Dec 12, 2018·Acta Psychologica·Dennis M ShafferCage Cramer

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