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The verbal instruction in favour of action effects can influence the congruity effect of grasping behaviours

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Abstract

Seeing large or small objects in a choice-reaction task facilitates power and precision grip, respectively. According to the motor-simulation account, this congruity effect reflects an automatic access to object representation, including the grip usually associated to the object. Alternatively, this effect might come from an overlap between magnitude codes of the manipulable objects and those of the response’s outcomes. In Experiment 1, participants saw objects usually grasped with power or precision grip and had to mimic these gestures on a specific device. Large-switch responses (e.g., power grip) always produced a high-pitch tone (i.e., a small magnitude perceptual outcome) while small-switch responses (e.g., precision grip) always produced a low-pitch tone (i.e., a large magnitude perceptual outcome). We also manipulated the instructions asking one group to perform specific grips, while the other had to produce specific pitch tones. Even if results revealed shorter RTs in the object-response compatible condition compared to the non-compatible condition for both conditions, they also revealed a decrease of the congruity effect in the tone-instruction group (+ 13 ms) compared to the switch-instruction group (+ 25 ms). We conducted a second experiment based on the tone-instruction group but the response device was installed horizontally. Thus, the grasping component of the responses was removed as in Heurley et al. (2020). Results revealed a congruity effect supporting the magnitude coding account instead of the motor-simulation account. Results also seem to support a kind of permeability of the coding to the influence of intentional processes related to the processing of action outcomes.

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Data availability

The datasets, the stimuli, and the E-Prime script of the experiments are available at https://osf.io/rmkj4/.

Notes

  1. In the literature, this effect is frequently known as the “potentiation effect” (e.g., Barsalou, 2008; Ellis & Tucker, 2000; Tucker & Ellis, 2001). However, as this terminology often implies a motor-simulation process, we prefer use the term “congruity effect” to avoid confusion regarding the interpretation of this effect.

  2. We did not focus on the effect of lateralized responses initially reported by Tucker and Ellis (1998) because a lot of studies have been already developed to demonstrate that the spatial coding account better explain this effect (for a review, see Proctor & Miles, 2014; for a metanalysis, see Azaad et al., 2019).

  3. The mapping between grasping responses (power grip vs. precision grip) and colours (orange vs. blue) was counterbalanced between participants as much as possible with a random assignation. Thus, for the switch-instruction group, both mapping group “power grip/blue-precision grip/orange” and “power grip/orange-precision grip/blue” are of 21 participants. For the tone-instruction group, the mapping groups are of 22 and 20 participants, respectively.

  4. Therefore, like for the switch-instruction group, the mapping between each response (high-pitch tone vs. low-pitch tone) and colours (orange vs. blue) was counterbalanced between participants. There are also two subgroups, each composed of 21 randomly assigned participants.

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Correspondence to Ronan Guerineau or Loïc P. Heurley.

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All procedures conducted in our studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Guerineau, R., Heurley, L., Sabek, H. et al. The verbal instruction in favour of action effects can influence the congruity effect of grasping behaviours. Curr Psychol 43, 7974–7985 (2024). https://doi.org/10.1007/s12144-023-04995-2

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