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Our brains use random sensory noise to make choices between equally appealing options. Participants were unaware of this noise influence on their decisions, except when they actively resisted it.

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Area of Science:

  • Neuroscience
  • Decision-making
  • Perception

Background:

  • The brain's decision-making process for equally attractive choices remains unclear.
  • Sensory noise may play a role in breaking decision symmetry.

Purpose of the Study:

  • To investigate how visual sensory noise influences human choice selection.
  • To examine participants' awareness of noise-induced bias in decision-making.

Main Methods:

  • Participants viewed random-dot kinematograms with varying motion coherence.
  • Decisions were cued as either instructed or free choice.
  • Subjective awareness of choice freedom was assessed.

Main Results:

  • Sensory noise in visual motion biased free choices, regardless of cue clarity.
  • Participants generally remained unaware of the sensory bias influencing their decisions.
  • Resisting the bias led to a strong subjective sense of independent choice.

Conclusions:

  • Sensory noise can unconsciously bias action selection in free-choice scenarios.
  • Awareness of choice freedom does not correlate with the degree of sensory influence.
  • Inhibitory control is closely linked to the subjective experience of free will.