Crossmodal Attention in Time

Behavioral Adult
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In conductual paradigms, behavioral performance is shown to be increased when participants are given information about when a stimulus would appear. But does attention in time work as a supra-modal mechanism? In our experiment participants must do a discrimination task about a visual or a tactile stimulus. Using pedals, they have to respond as fast as possible indicating if stimulus is single or double (lift toes from the anterior pedal if double, lift heel from the posterior pedal if single), independently of the modality. For each participant there will be a primary modality (say visual) which has more probabilities to occur compared to the secondary modality (say tactile). The participants must attend either the first time interval (first SOA) or the second time interval (second SOA), changing at every block. At every block, stimuli in the primary modality have more probabilities to occur at the attended SOA, while the stimuli in the secondary modality have more probabilities to occur at the unattended SOA. We're going to measure Reaction Times and accuracy of subjects' responses.