Language production and the execution of motor acts have long been thought to have similarities in the rules of their execution. Recent studies have begun to directly compare these two processes by measuring certain phenomena found in both. Until now, comparisons have only been made in parallel, with different groups of participants and/or tasks. A novel paradigm was developed to compare phenomena classically found in motor planning or language production both within and across the two domains. The first phenomenon of interest in this study was the hysteresis effect, or the persistence of a choice when repeating that choice. Evidence for the hysteresis effect is robust in motor production studies, though it has only recently been of focus in language research. The next phenomenon was the inverse frequency effect, an effect associated with language production priming which finds that subordinate choices prime more effectively than dominant ones. A third effect of interest was the plan reuse benefit, or the savings of repeating an action over developing a new action plan. Finally, the contrast effect (where responses to a particular stimulus is affected by the nature of the response on the preceding trial) was a focus because it is often found with hysteresis, but study of the effect has not been previously afforded in language production. We expected that motor and language production would share commonalities in their decision-making processes and therefore expected that similar patterns of behavior would be observed for both tasks across the four effects of interest. Results showed there was a hysteresis effect in each domain individually. When comparing across tasks, the effect was not in the same place. The inverse frequency effect and plan reuse benefit were evident in the motor task, but not the language task. Contrast effects were not found in either domain. Taken together, these results suggest that motor and language production may not share the same underlying mechanisms. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]