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Bird expertise does not increase motion sensitivity to bird flight motion

Lookup NU author(s): Dr Quoc Vuong



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2021. All Rights Reserved.While motion information is important for the early stages of vision, it also contributes to later stages of object recognition. For example, human observers can detect the presence of a human, judge its actions, and judge its gender and identity simply based on motion cues conveyed in a point-light display. Here we examined whether object expertise enhances the observer's sensitivity to its characteristic movement. Bird experts and novices were shown point-light displays of upright and inverted birds in flight, or upright and inverted human walkers, and asked to discriminate them from spatially scrambled point-light displays of the same stimuli. While the spatially scrambled stimuli retained the local motion of each dot of the moving objects, it disrupted the global percept of the object in motion. To estimate a detection threshold in each object domain, we systematically varied the number of noise dots in which the stimuli were embedded using an adaptive staircase approach. Contrary to our predictions, the experts did not show disproportionately higher sensitivity to bird motion, and both groups showed no inversion cost. However, consistent with previous work showing a robust inversion effect for human motion, both groups were more sensitive to upright human walkers than their inverted counterparts. Thus, the result suggests that real-world experience in the bird domain has little to no influence on the sensitivity to bird motion and that birds do not show the typical inversion effect seen with humans and other terrestrial movement.

Publication metadata

Author(s): Hagen S, Vuong QC, Chin MD, Scott LS, Curran T, Tanaka JW

Publication type: Article

Publication status: Published

Journal: Journal of Vision

Year: 2021

Volume: 21

Issue: 5

Pages: 1-11

Online publication date: 05/05/2021

Acceptance date: 02/04/2018

Date deposited: 24/05/2021

ISSN (electronic): 1534-7362

Publisher: Association for Research in Vision and Ophthalmology Inc.


DOI: 10.1167/jov.21.5.5

PubMed id: 33951142


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