Is any awareness necessary for an Ne?

Area of Science:

• Cognitive Neuroscience
• Electrophysiology
• Psychology

Background:

• The Error-Related Negativity (ERN) is an electrophysiological signal indicating error processing, previously thought to be independent of error awareness.
• Existing research showed similar ERN amplitudes for both detected (Aware) and undetected (Unaware) errors, suggesting a preconscious mechanism.
• A concern was that subjects might be aware of errors but lack confidence to report them, confounding previous findings.

Purpose of the Study:

• To investigate the role of response confidence in the Error-Related Negativity (ERN).
• To determine if the ERN is truly independent of error awareness or if confidence influences its manifestation.
• To differentiate between automatic error detection and subjective error evaluation.

Main Methods:

• A betting paradigm was employed within a choice reaction time task to gauge subject confidence.
• Subjects judged response accuracy and bet on their judgment (high, medium, low confidence).
• ERN amplitudes were analyzed based on error awareness (Aware vs. Unaware) and confidence levels (high vs. low bets).

Main Results:

• Replicating prior work, overall ERN was similar for Aware and Unaware errors when confidence was not considered.
• In high-confidence trials, a significant ERN was observed only for Aware errors; confident Unaware errors showed no difference from correct responses (CRN).
• In low-confidence trials, both Aware and Unaware errors elicited an intermediate ERN/CRN amplitude.

Conclusions:

• The ERN's amplitude is dependent on error awareness, particularly in confident judgments.
• Subjective confidence and reporting accuracy significantly modulate the electrophysiological response to errors.
• These findings suggest the ERN reflects not just error occurrence but also the confidence in evaluating that error.