The temporal dynamics of task processing and choice in a novel multitasking paradigm

Mittelstädt, Victor; Mackenzie, Ian Grant; Heins, Sebastian; Miller, Jeff · 2024 · OpenAlex-citations

DOI: 10.1007/s00426-024-01971-8

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Summary

This study investigates the temporal dynamics of task processing and voluntary choice within a novel "choice/no-go" multitasking paradigm. The research addresses limitations in existing task-switching methods, which often rely on external cues or predictable sequences that introduce confounding processing loads. By developing a hybrid paradigm where task selection is determined by stimulus outcomes rather than external instructions, the authors aim to integrate the study of switch costs, dual-task interference, and task choice repetition biases into a single experimental framework. The methodology involved two experiments using letter and number categorization tasks. Participants performed trials where stimuli for two tasks were presented sequentially. In "forced-no-go" trials, one stimulus required a response (go) while the other required inhibition (no-go), forcing participants to process both stimuli to determine the required action. In "free-choice" trials, both stimuli required responses, allowing participants to choose which task to perform. The study manipulated the stimulus onset asynchrony (SOA) between the two stimuli (50 ms vs. 300 ms) to assess capacity limitations. Experiment 1 included 34 participants who completed online trials, with data analyzed for reaction times (RTs) and error rates. Results indicated that participants frequently processed the no-go stimulus before switching to the go-task, evidenced by significant dual-task interference effects. Specifically, responses to the second stimulus were delayed at short SOAs, suggesting that no-go decisions consume limited cognitive resources similar to go-decisions. Switch costs were observed, indicating that reconfiguring task goals incurs a performance penalty. In free-choice trials, participants exhibited a strong bias toward repeating the task performed in the previous trial. This repetition bias was influenced by both cognitive factors (goal activation) and environmental constraints (stimulus presentation order). The data suggested that task-specific information increases goal activations for both tasks concurrently, but participants favored central processing of the second-presented task to optimize behavior when shorter processing times were required. The significance of this work lies in its demonstration that distinctions between free and forced task goals stem from differences in internal representations rather than external presentation formats. The findings support the view that multitasking interference arises from overlapping capacity limitations in parallel processing and switch-related reconfiguration. By eliminating extraneous cue processing, this paradigm provides a cleaner assessment of the mechanisms underlying task selection and performance, offering new insights into how humans balance multiple tasks in complex environments.

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Topics

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• task switching
• dual task multitasking
• dual task performance

Information type

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• Empirical Findings: behavioral performance data