First- and second-order transformational apparent motion rely on common shape representations

When one figure is replaced with another that overlaps its spatial location, observers perceive an illusory, continuous shape change of the original object, a phenomenon known as transformational apparent motion (TAM). The current study investigated the extent to which TAM depends on a common, high-...

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Bibliographic Details
Published in:Vision research (Oxford) 2021-11, Vol.188, p.246-250
Main Authors: Hartstein, K.C., Saleki, S., Ziman, K., Cavanagh, P., Tse, P.U.
Format: Article
Language:English
Subjects:
Contrast Sensitivity
Humans
Illusions
Motion
Motion Perception
Psychophysics
Second-order stimulus
Transformational apparent motion
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Summary:When one figure is replaced with another that overlaps its spatial location, observers perceive an illusory, continuous shape change of the original object, a phenomenon known as transformational apparent motion (TAM). The current study investigated the extent to which TAM depends on a common, high-level shape representation that is independent of the shape-defining attribute. Specifically, we tested whether TAM is perceived similarly for both first- and second-order objects, defined by luminance and texture contrast, respectively. A compelling motion percept was observed in second-order TAM displays that was comparable to that seen in first-order TAM displays. Importantly, TAM for both stimulus classes showed the same pattern over a range of stimulus onset asynchronies. These results support the high-level shape account, indicating that TAM is driven by segmentation mechanisms that rely on high-level shape information rather than low-level visual characteristics.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2021.07.013