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The visual size of graspable objects is needed to induce the potentiation of grasping behaviors even with verbal stimuli

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Abstract

Merely perceiving objects usually grasped with a power or a precision grip (e.g., an apple vs. a cherry) potentiate power-grip and precision-grip responses, respectively. According to the size-coding account, this potentiation effect is due to the compatibility between size codes associated with both stimuli and responses, rather than to the simulation of motor information stored at a conceptual level (i.e., the embodied account). At the stimulus level, size-coding would occur, because objects associated with a power grip are usually presented in a larger visual size than objects associated with a precision grip. However, this explanation is challenged by results, showing that reading nouns of objects associated with power or precision grip also leads to potentiation effects, even though the visual size of the displayed object is no longer perceived. Therefore, we designed three experiments to better understand this word-based potentiation effect and to investigate whether it relies on size codes. Our results showed a word-based potentiation effect only when the object nouns were interleaved with pictures depicting the objects in their typical visual size. We discuss the contributions of these results for both the size-coding account and the embodied account of the potentiation effect of grasping behaviors.

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https://osf.io/fqhu5.

Notes

  1. Of note, potentiation effects have been explained via three different concepts: micro-affordances, motor simulation, and motor representations (for a discussion, see Chong & Proctor, 2020). In this article, we only used the concept of micro-affordances and motor simulation for a simplification.

  2. We conducted our power analysis based on the potentiation effect reported by Tucker and Ellis (2004) for their Experiment 3. They said: “Averaged over both images and words the compatibility effect was highly significant for both measures of performance. Reaction times for compatible trials were on average 10.1 ms faster, F(1, 69) = 24.8, p < .001.” From this statement, we computed the corresponding \({\upeta }_{\mathrm{p}}^{2}\)= .26 and its bias-corrected version \({\upomega }_{\mathrm{p}}^{2}\)= .25 (e.g., Lakens, 2013, for a brief discussion on the advantages of \({\upomega }_{\mathrm{p}}^{2}\) over \({\upeta }_{\mathrm{p}}^{2}\)). The results of the power analyses using \({\upeta }_{\mathrm{p}}^{2}\)= .26 or \({\upomega }_{\mathrm{p}}^{2}\)= .25 yielded very similar sample size (n = 26 vs. n = 27, respectively). We chose to report the results of the analysis conducted with the smallest effect size.

  3. For each experiment, as well as for the between-experiment analysis, we run linear mixed models which largely confirmed ANOVA results. Detailed method and results are available in the “supplementary material”, specifically in Table S2 (results for the three experiments separately) and S3 (results for Experiments 1 and 2 combined). Raw data of all experiments are available online (see https://osf.io/fqhu5).

  4. Obviously, in French, we did not use the words “APPLE” and “CHERRY”, but a similar reasoning applies to the French words we used (see Appendix 1).

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Correspondence to Mohamed Halim Harrak.

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All procedures performed in 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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Appendix

Appendix

Appendix 1

List of words used with (1) the phase in which they were used (familiarization or test), (2) the size associated with the object denoted (large or small), (3) their English names, (4) their French names, (5) their associated film frequency (from Lexique3.org, New et al., 2004), (6) their associated book frequency (also from Lexique3.org, New et al., 2004), and (7) their number of letters. Both frequencies were reported per million of occurrences.

Phase

Associate size

English name

French name

Film frequency

Book frequency

Number of letters

Familiarization

Large

Lemon

Citron

8.10

9.05

6

Familiarization

Large

Banana

Banane

6.09

4.05

6

Familiarization

Small

Radish

Radis

1.81

3.11

5

Familiarization

Small

Peanut

Cacahuette

1.71

0.74

10

Test

Large

Apple

Pomme

19.77

46.08

5

Test

Large

Pear

Poire

5.67

10.81

5

Test

Large

Eggplant

Aubergine

0.35

0.61

9

Test

Large

Avocado

Avocat

89.28

24.32

6

Test

Small

Cherry

Cerise

2.75

3.31

6

Test

Small

Strawberry

Fraise

5.28

3.92

6

Test

Small

Hazelnut

Noisette

0.57

1.69

8

Test

Small

Grape

Raisin

5.88

4.86

6

Appendix 2

Pictures of objects used with (1) the phase in which they were used (familiarization or test) and (2) the size associated with the object depicted: (a) large or (b) small.

figure a

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Harrak, M.H., Heurley, L.P., Morgado, N. et al. The visual size of graspable objects is needed to induce the potentiation of grasping behaviors even with verbal stimuli. Psychological Research 86, 2067–2082 (2022). https://doi.org/10.1007/s00426-021-01635-x

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