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People often start mental coin tosses with Heads due to order bias. This "reachability" bias favors the first option presented in any binary choice, impacting surveys and tests.

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Area of Science:

  • Cognitive Psychology
  • Decision Science

Background:

  • Individuals asked to simulate random sequences, like coin tosses, exhibit systematic deviations from true randomness.
  • A notable, yet under-recognized, divergence is the tendency to initiate mental coin toss sequences with Heads.

Purpose of the Study:

  • To investigate the phenomenon of first-toss bias in mental coin toss simulations.
  • To introduce and explain the concept of 'reachability' as a general response bias.
  • To explore the broader implications of this bias in various binary choice scenarios.

Main Methods:

  • Analysis of existing datasets on simulated coin tosses.
  • Experimental manipulation of instruction order (Heads vs. Tails first) to test bias reversibility.
  • Conceptualization of the 'reachability' bias to explain observed patterns.

Main Results:

  • Approximately 80% of participants initiated mental coin toss sequences with Heads.
  • This first-toss bias was found to be reversible by altering the presentation order in instructions.
  • The 'reachability' bias, favoring the initially presented option, was identified as the underlying mechanism.

Conclusions:

  • The order in which options are presented significantly influences choices in binary decision-making.
  • The 'reachability' bias extends beyond randomness cognition, affecting surveys and tests.
  • Understanding presentation order effects is crucial for designing unbiased binary choice systems.