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Stimulus-preceding negativity represents a conservative response tendency.

Takahiro Hirao1, Timothy I Murphy, Hiroaki Masaki

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People tend to stick with their first choice, even when changing is better. This study shows that the stimulus-preceding negativity (SPN) brain activity reflects this strong tendency to retain initial decisions.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Decision Making

Background:

  • Humans exhibit a conservative bias, often retaining initial decisions despite opportunities to change.
  • The stimulus-preceding negativity (SPN) is an electrophysiological measure linked to anticipating feedback in decision-making tasks.

Purpose of the Study:

  • To investigate if the SPN reflects the strong tendency to retain initial decisions.
  • To examine SPN differences between retaining and changing decisions across various gambling tasks.

Main Methods:

  • Comparison of SPNs in three card-gambling tasks with varying probabilities for changing decisions.
  • Inclusion of a Monty Hall dilemma task where changing significantly increases winning probability.
  • Analysis of behavioral data on decision retention rates and electrophysiological SPN data.

Main Results:

  • Behavioral data confirmed a general tendency to retain initial decisions across all tasks.
  • The rate of retaining initial choices was lower in the counterintuitive Monty Hall dilemma task.
  • SPNs were significantly larger on trials where participants retained their initial decision compared to change trials.

Conclusions:

  • The SPN appears to reflect the neural activity underlying the strong tendency to maintain self-chosen decisions.
  • SPN amplitude can serve as an electrophysiological marker for the expectancy of outcomes related to initial choices.