2.2.3. Referent for communication
This protocol is extracted from research article:
Crossmodal correspondences as common ground for joint action
Acta Psychol (Amst), Jan 1, 2021; DOI: 10.1016/j.actpsy.2020.103222

The referents for communication were visual stimuli that varied along one particular dimension (size, brightness or color, depending on the experiment; see Table 2). In addition to the one-dimensional stimulus features used in all experiments, participants in Experiments 1 and 2 received a further ‘two-dimensional’ set of stimuli in a second part of the experiment. These two-dimensional stimuli (Table 2) varied along two perceptual feature dimensions, i.e., in both size and brightness. Importantly, the stimuli were designed such that the mappings for the two dimensions were not congruent, e.g., the large circle was white such that its size corresponded to a low-pitched tone (large > low pitch) yet its brightness corresponded to a high-pitched tone (bright > high pitch). Thus, depending on the chosen stimulus dimension (size or brightness), the resulting crossmodal mapping would differ, allowing us to determine whether participants used the same mapping as in the first, one-dimensional part of the experiment or whether they established a different mapping.

Visual stimulus properties along with the predicted crossmodal mappings (in italics). In the two-dimensional part of Experiments 1 and 2, two alternative predictions could be made, as participants could either stick to the same crossmodal mappings as in the one-dimensional part (‘History’) or switch to a different mapping (‘Novelty’).

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