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Building a Lego wall: Sequential action selection.

Amy Arnold1, Alan M Wing1, Pia Rotshtein1

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Journal of Experimental Psychology. Human Perception and Performance
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Summary
This summary is machine-generated.

Building Lego walls revealed how cognitive load impacts action selection. Complex decisions at task boundaries slowed action timing and increased errors, supporting hierarchical control of sequential behavior.

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Area of Science:

  • Cognitive Psychology
  • Human Motor Control
  • Behavioral Neuroscience

Background:

  • Understanding sequential action control is crucial for explaining complex behaviors.
  • Existing research often separates motor sequence production from real-world action selection.
  • Hierarchical structures in tasks may influence decision-making and action timing.

Purpose of the Study:

  • To investigate the interplay between motor sequence production and action selection in a hierarchical task.
  • To examine how cognitive load and decision points affect the timing and accuracy of sequential actions.
  • To provide empirical support for hierarchical models of behavioral control.

Main Methods:

  • Participants built two distinct Lego walls with hierarchical structures under varying cognitive loads.
  • Three-dimensional motion tracking precisely measured action selection times.
  • A dual-task paradigm was employed to manipulate cognitive load.
  • Analysis focused on selection times at decision boundaries versus non-decision boundaries.

Main Results:

  • Action selection was significantly slower at decision boundary points compared to non-decision boundaries.
  • Decision points influenced action selection timing even before the selection window.
  • Increased cognitive load (dual-task) led to more selection errors, particularly at chunk boundaries requiring decisions.
  • Errors were concentrated at hierarchical boundaries, especially those involving choices.

Conclusions:

  • The findings support a hierarchical model of sequential behavior control.
  • Decision-making processes at task boundaries are critical determinants of action selection efficiency.
  • Cognitive load significantly impacts the ability to manage complex, hierarchical action sequences.