Iani C.

Lugli L.

Nicoletti R.

Rubichi S.

Scerrati E.

English

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DO MY HANDS PRIME YOUR HANDS? EFFECTS OF (GRASPED) HANDLES ON KEYPRESS RESPONSES WITH TWO-HANDLED OBJECTSRubichi1, S., Scerrati1, E., Lugli2, L., Nicoletti3, R., Iani3, C.1 Department of Education and Humanities, University of Modena and Reggio Emilia, Italy2 Department of Philosophy and Communication, University of Bologna, Italy3 Department of Communication and Economics, University of Modena and Reggio Emilia, Italysandro.rubichi@unimore.it/srubichi@unimore.itINTRODUCTION• Research has shown that photos of graspable objects produce faster andmore accurate responses when the position of the graspable part (i.e. thehandle) and the actual responding hand of the participant are spatiallyaligned [1].• Such correspondence or alignment effect has been interpreted as evidencein favour of automatic motor activation and has so far been studied withone-handled objects, that is, objects graspable on one side only [1-3].• The aim of the present study is to explore whether a) graspable objects thatare usually grasped by two hands (i.e. two-handled objects; e.g. shears)show similar effects when they are shown as grasped on one side; b) thereis an effect of the viewpoint or perspective in which the grasping hands areshown (i.e. one’s own vs. other people’s viewpoint).REFERENCES[1] Tucker, M., & Ellis, R. (1998). On the relations between seen objects and components of potential actions. Journal of Experimental Psychology: Human Perception and Performance, 24(3), 830.[2] Pappas, Z. (2014). Dissociating Simon and affordance compatibility effects: Silhouettes and photographs. Cognition, 133(3), 716-728.[3] Pellicano, A., Iani, C., Borghi, A. M., Rubichi, S., & Nicoletti, R. (2010). Simon-like and functional affordance effects with tools: The effects of object perceptual discrimination and object actionstate. Quarterly Journal of Experimental Psychology, 63(11), 2190-2201.[4] Iani, Ferraro, Maiorana, Gallese, & Rubichi (2018). Do already grasped objects activate motor affordances? Psychological Research, 1-12.[5] Borghi, A. M., Bonfiglioli, C., Lugli, L., Ricciardelli, P., Rubichi, S., & Nicoletti, R. (2007). Are visual stimuli sufficient to evoke motor information? Studies with hand primes. Neuroscience Letters, 411(1),17-21.METHODSThirty-eight (Exp. 1), thirty-six (Exp. 2) and forty (Exp. 3)participants were asked to categorize 8 two-handled objects (Fig. 1)as being mainly used during spare time or while cooking. Each objectcould appear as not grasped, as grasped by the two hands, or asgrasped by one hand only (i.e., left or right). When the object wasgrasped by one hand only, the grasping hand could be spatiallycompatible (on the same side) or incompatible (on the opposite side)with the response key. Across Experiments 1 and 2 we manipulatedthe perspective in which the grasping hands were shown (allocentricvs. egocentric), whereas in Experiment 3 we manipulated theresponse mode by replacing between-hands with within-handresponses (see Fig. 2 below for details).Fig. 2: Illustration of the 4 experimental conditions in experiments 1 (panel A), 2 (panel B), and 3 (panel C).RESULTS & DISCUSSION• For all three experiments a Repeated Analysis of Variance (ANOVA) with Condition as the within-subject factor was performed on RTs and ERs. The maineffect of Condition was significant for RTs and ERs in Experiment 2 [F(3,111) = 21.91, p < .001, ηp2 =.372 and F(3,111) = 11.49, p < .001, ηp2 =.237,for RTs and ERs, respectively] and 3 [F(3,117) = 23.95, p < .001, ηp2 =.380 and F(3,117) = 6.56, p = .001, ηp2 =.144, for RTs and ERs, respectively],whereas it was significant for RTs only in Experiment 1 [F(3,105) = 16.99, p < .001, ηp2 =.327]. Descriptive statistics shown in Table 1.• For all three experiments Bonferroni-corrected planned comparisons revealed better performances in the Compatible Grasping compared to theIncompatible Grasping condition, indicating a facilitation for the processing of two-handled objects when they appeared as grasped on the same side asthe response (i.e., correspondence or alignment effect).• Further independent T-test aimed at comparing the magnitude of the correspondence effect revealed that the correspondence effect was smaller inExperiment 1 (15 ms) than in Experiment 2 (28 ms), t(72) = 2.47, p = .016, whereas it did not differ across experiments 2 and 3, t(76) = 1.68, p =.097 . (see Fig. 3).• Taken together, these results suggest that the activation of the motor system when viewing graspable objects may be moderated by the viewpoint inwhich the grasping hands are shown (our own vs. other people’s). An object that is shown as already grasped by other people’s hands might indeed beperceived as an object not available for one’s own action. As such, it might induce activation in the motor system to a lesser extent [4, 5].480500520540560580600620COMPATIBLE GRASPING INCOMPATIBLE GRASPINGEXPERIMENT 1 EXPERIMENT 2 EXPERIMENT 3Fig. 3: The correspondence effect in all three experiments.PANEL APANEL BTable 1: Mean RTs and percentages of error (with standard deviations in parentheses) as a function ofCondition from all three Experiments.Fig. 1: Two-handled objects used in experiments 1, 2 and 3.PANEL CEXPERIMENT 1 EXPERIMENT 2 EXPERIMENT 3 CONDITION RTS (MS) ERS (%) RTS (MS) ERS (%) RTS (MS) ERS (%)OBJECT ALONE534(50.2)3.1(2.9)549(63.0)4.2(5.0)592(74.0)4.3(3.8)COMPATIBLE GRASPING531(50.6)3.0(2.2)543(71.1)3.5(5.5)593(81.4)3.4(4.0)INCOMPATIBLE GRASPING546(51.9)4.3(3.7)571(71.7)6.8(6.7)612(80.8)5.1(5.1)TWO-HANDED GRASPING543(52.5)3.2(2.6)558(70.9)3.9(5.5)605(77.1)3.7(3.9)

Do my hands prime your hands? Effects of (grasped) handles on keypress responses with two-handled objects

https://iris.unimore.it/retrieve/handle/11380/1196219/252670/Poster_icps2019.pdf

Do my hands prime your hands? Effects of (grasped) handles on keypress responses with two-handled objects

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