Abstract
The current study evaluated the effects of vocal and motor blocking tasks on sequencing visual stimuli for 16 participants. In Experiment 1, we trained participants to vocally tact stimuli and blocked vocal-verbal mediation during sequencing. In Experiment 2, we taught participants to tact one set of stimuli vocally and another with hand signs, and blocked verbal and motor mediation. In Experiment 3, we assessed the effects of verbal blocking on sequences established via tact training and imitation (matching). Fifteen of 16 participants passed vocal sequencing tests, and five of eight passed hand-signed tests. Three of eight participants required joint control training for stimuli taught via hand signs. Vocal blocking procedures prevented accurate sequencing on vocal and hand signed sequences, but not sequences established via imitation. Combined results suggest vocal blocking procedures prevent verbal mediation, and training all joint control components is not necessary for adults to sequence stimuli.