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Anticipating the magnitude of response outcomes can induce a potentiation effect for manipulable objects

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Abstract

Merely seeing large objects (e.g., apples) potentiates power grip whereas seeing small objects (e.g., strawberries) potentiates precision grip. According to the embodied cognition account, this potentiation effect reflects automatic access to object representation, including the grip usually associated with the object. Alternatively, this effect might be due to an overlap between magnitude codes used to code manipulable objects and magnitude codes used to code responses outcomes. In Experiment 1, participants saw objects usually grasped with a power or precision grip and had to press keys either with their forefinger or with their palm, each response generating a low or high tone (i.e., a large vs. small perceptual outcome, respectively). Tones were automatically delivered by headphones after the responses have been made in line with the ideomotor theories according to which voluntary actions are carried out due to the anticipation of their outcomes. Consistent with the magnitude-coding hypothesis, response times were shorter when the object and the anticipated response outcome were of the same magnitude than when they were not. These results were also consistent with a between-experiment analysis. In Experiments 2 and 3, we investigated to what extent removing or switching the outcomes during the experiment influence the potentiation effect. Our results support that the potentiation effect of grasping behaviours could be due to the compatibility between magnitude codes rather than to the involvement of motor representations. Our results also suggest a spontaneous use of the magnitude of response outcomes to code responses, as well as the flexibility of this coding processes when responses outcomes are altered.

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Data availability

The datasets, the stimuli, and the E-Prime script of the experiments are available at https://osf.io/7d3mf/?view_only=ea249306b98e4a7ba631d31f5274ed2a

Notes

  1. The term “potentiation” is usually employed to refer to affordance effects rather than to effects due to a compatibility of codes. Researchers commonly use the “facilitation” to refer to this latter case. But substantially, both concepts describe a similar phenomenon: the advantage in a compatible condition compared to a non-compatible one. Accordingly, in this manuscript, we chose to only use the term “potentiation” (not “facilitation”) that we defined as shorter RTs in the compatible condition than in incompatible one (whatever its possible origin, i.e., affordance or code compatibility).

  2. As highlighted by Pfister (2019) and Pfister & Kunde, 2013), our artificial auditory outcome was not the only perceptual outcome associated with the responses. There were also various perceptual outcomes that were more intrinsic to the responses (e.g., tactile feedbacks when participants press the key). However, based on Heurley’s et al. (2020) experiments, we hypothesized that this auditory outcome will be enough to induce a stimulus-outcome compatibility.

  3. In contrast, the spatial-musical association of response codes (SMARC, Ishihara et al., 2008; Rusconi et al., 2006) suggests an alternative view with low tone coded as “small” and high tone coded as “large”. The current study was not designed to disentangle these approaches.

  4. Thus, there were four mapping groups of seven participants: “forefinger, blue, low tone/palm, orange, high tone”, “forefinger, blue, high tone/palm, orange, low tone”, “forefinger, orange, low tone/palm, blue, high tone”, and “forefinger, orange, high tone/palm, blue, low tone”.

  5. It is noteworthy that these results are consistent with the multimodal coupling (large/low tone vs. small/high tone) already reported by Parise and Spence 2009; 2015, Parise and Ernst 2016) and not the reverse coupling reported by Rusconi et al. (2006). Further studies should address more directly why low and high tones are respectively linked to large and small magnitude, and not the reverse.

  6. The Bayesian analyses performed in JASP rely on sequential sampling methods. Due to the numerical approximation of the algorithm, the resulting BF vary from one analysis to another even if it is conducted on the same dataset in the exact same way. Even if some authors consider this variability to be small (e.g., Goss-Sampson et al., 2020), Pfister (2021) warned that it can be very large in some cases. In JASP, this variability is quantified by the error percentage provided in the right-most column of the full model comparison table (i.e., “error %”). The higher this error percentage the more the resulting BF vary from one analysis to another. This variability partly depends on the number of samples used by the sequential sampling methods. The higher this number of samples the smaller the variability. JASP allows to increase this number of samples by setting the “Numerical Accuracy” (under the “Additional Options” section of the Bayesian ANOVA module) to manual and by choosing the desired number of samples. The default value is 10,000 samples. The results we reported here came from a sequential sampling methods based on the maximum number of samples allowed by JASP (i.e., 10,000,000 samples). The averaged error percentage for all the Bayes Factors computed for the full model comparison was 0.88% (s = 1.64%). This averaged error percentage is very small and indicates that our results should vary only slightly from one analysis to another. Our reported Bayesian analysis focused on the BFexcl rather than on all the BF01 from the full model comparison. BF01 is the ratio between the posterior probability of the data under the null hypothesis (H0) and the posterior probability of the data under the alternative hypothesis (H1) and is interpreted as the strength of evidence for H0 relative to the strength of evidence for H1. Even if JASP does not provide error percentage for BFexcl, these error percentages should also be small because they are related to the error percentages of the BF from the full model comparison upon which the calculation of BFexcl is based.

  7. Note that the inclusion Bayes Factor (BFincl) reflects the strength of evidence supporting the averaged model including the existence of a given effect (i.e., the alternative hypothesis, H1) relative to the strength of evidence supporting the averaged model excluding the existence of this effect (i.e., the null hypothesis, H0). BFincl = 1/BFexcl.

  8. The unstandardized or raw effect size is merely the mean difference between RTs in compatible conditions (e.g., small objects/high tone) and RTs in non-compatible conditions (e.g., large object/high tone) for each participant in our between-experiments analysis.

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Acknowledgements

We would like to thank Eric-Jan Wagenmakers and Richard D. Morey for answering our questions on Bayesian analyses.

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Correspondence to Ronan Guerineau or Loïc P. Heurley.

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Conflict of interest

We have no conflict of interest to disclosed. This work was funded by the École Doctorale Sciences du Sport, de la Motricité et du Mouvement Humain (SSMMH) which awarded a PhD scholarship to Ronan Guérineau.

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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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Informed consent was obtained from all individual participants included in the study.

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Appendix

Appendix

See Fig. 4.

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figure 4

Large (a) and small (b) objects used in both experimental phases

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Guerineau, R., Heurley, L.P., Morgado, N. et al. Anticipating the magnitude of response outcomes can induce a potentiation effect for manipulable objects. Psychological Research 86, 667–684 (2022). https://doi.org/10.1007/s00426-021-01535-0

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