RESUMEN
Our aim was to study the processes involved in the spatial coding of the body during actions producing multiple simultaneous effects. We specifically aimed to challenge the intentional-based account, which proposes that the effects used to code responses are those deemed relevant to the agent's goal. Accordingly, we used a Simon paradigm (widely recognized as a suitable method to investigate the spatial coding of responses) combined with a setup inducing a multimodal discrepancy between visual and tactile/proprioceptive effects (known to be crucial for body schema construction and action control). To be more precise, the setup allowed to horizontally reverse the visual effects of the hands compared to the tactile/proprioceptive effects (e.g., the right hand was seen as being on the left). In Experiment 1, the visual effects were not reversed. However, in Experiment 2, the visual effects were reversed, and the task emphasized the relevance of these effects to the participants. In Experiment 3, the visual effects were also reversed, but the task emphasized the relevance of tactile/proprioceptive effects. A Simon effect, based on the location of the tactile/proprioceptive effects, was observed in Experiments 1 and 3. However, in Experiment 2, the Simon effect was partially driven by the location of the visual effects. These findings collectively support that the agent's intention plays a prominent role in the representation of their body during action. This work also suggests a promising avenue for research in linking action and body representations.
Asunto(s)
Retroalimentación Sensorial , Desempeño Psicomotor , Percepción Visual , Humanos , Masculino , Femenino , Adulto , Adulto Joven , Percepción Visual/fisiología , Desempeño Psicomotor/fisiología , Retroalimentación Sensorial/fisiología , Percepción del Tacto/fisiología , Percepción Espacial/fisiología , Tiempo de Reacción/fisiologíaRESUMEN
We aimed to better understand the link between vocalization and grasping. We especially test whether neurocognitive processes underlying this interaction are not grasping specific. To test this hypothesis, we used the procedure of a previous experiment, showing that silently reading the syllable KA and TI can facilitate power- and precision-grip responses, respectively. In our experiment, the participants have to silently read the syllable KA or TI but, according to the color of the syllables, have merely to press a large or small switch (we removed the grasping component of responses). Responses on the large switch were faster when the syllable KA was read compared with TI and conversely for the responses carried out on the small switch. This result supports that the influence of vocalization is not restricted to grasping responses, and, in addition, it supports an alternative, non-grasping-specific model of interactions between vocalization and grasping.