Implicitly learned bias impacts decision-making but not metacognition.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Decision Making

Background:

• Implicit biases can unconsciously shape decision-making processes.
• The differential impact of implicit versus explicit learning of prior information on performance remains unclear.
• Understanding how prior knowledge influences perception is crucial for cognitive science.

Purpose of the Study:

• To investigate whether implicit and explicit learning of base-rate priors differentially influence perceptual decision-making.
• To examine the effect of awareness of prior probabilities on performance and confidence.
• To explore the mechanisms of implicit bias formation in perceptual tasks.

Main Methods:

• Participants judged the orientation of moving dot patterns under varying base-rate frequencies.
• Two groups were formed: one informed about base-rate differences, the other unaware.
• Behavioral data, including response bias and confidence ratings, were collected and analyzed.

Main Results:

• The explicitly informed group demonstrated greater utilization of prior information compared to the unaware group.
• Participants who implicitly learned priors showed a response bias, particularly when sensory information was ambiguous.
• Confidence ratings were higher for prior-consistent stimuli in the instructed group, but not in the implicitly learning group.

Conclusions:

• Base-rate priors can be learned implicitly and exert influence on perceptual decisions.
• Implicit learning of priors biases perception, but this effect is modulated by sensory evidence availability.
• Awareness of priors affects confidence, suggesting distinct neural or cognitive pathways for explicit and implicit learning.