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Defining filled and empty space: reassessing the filled space illusion for active touch and vision
University of Liverpool, UK.ORCID-id: 0000-0002-4730-6328
University of Liverpool, UK.
2016 (engelsk)Inngår i: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 234, nr 9, s. 2697-2708Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the filled space illusion, an extent filled with gratings is estimated as longer than an equivalent extent that is apparently empty. However, researchers do not seem to have carefully considered the terms filled and empty when describing this illusion. Specifically, for active touch, smooth, solid surfaces have typically been used to represent empty space. Thus, it is not known whether comparing gratings to truly empty space (air) during active exploration by touch elicits the same illusionary effect. In Experiments 1 and 2, gratings were estimated as longer if they were compared to smooth, solid surfaces rather than being compared to truly empty space. Consistent with this, Experiment 3 showed that empty space was perceived as longer than solid surfaces when the two were compared directly. Together these results are consistent with the hypothesis that, for touch, the standard filled space illusion only occurs if gratings are compared to smooth, solid surfaces and that it may reverse if gratings are compared to empty space. Finally, Experiment 4 showed that gratings were estimated as longer than both solid and empty extents in vision, so the direction of the filled space illusion in vision was not affected by the nature of the comparator. These results are discussed in relation to the dual nature of active touch. © 2016, The Author(s).

sted, utgiver, år, opplag, sider
Springer Verlag , 2016. Vol. 234, nr 9, s. 2697-2708
Emneord [en]
Cutaneous, Filled space illusion, Kinaesthetic, Length, Touch, Vision, adult, Article, controlled study, female, human, human experiment, kinesthesia, male, normal human, priority journal, randomized controlled trial, solid, space, standard, surface property, visual illusion, illusion, photostimulation, physiology, procedures, Humans, Illusions, Optical Illusions, Photic Stimulation, Vision, Ocular
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Identifikatorer
URN: urn:nbn:se:ri:diva-64204DOI: 10.1007/s00221-016-4673-xScopus ID: 2-s2.0-84970949914OAI: oai:DiVA.org:ri-64204DiVA, id: diva2:1741905
Merknad

 Correspondence Address: Collier, ES, UK. Funding details: Economic and Social Research Council, ESRC, ES/J500094/1; Funding text 1: The authors would like to thank Maria Sudell for her assistance coding the R script used in the statistical analyses. This work was supported by a grant from the Economic and Social Research Council to the first author [ES/J500094/1].

Tilgjengelig fra: 2023-03-07 Laget: 2023-03-07 Sist oppdatert: 2023-03-07bibliografisk kontrollert

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