Pupil Dilation Indexes But Does Not Causally Influence Conscious Error Detection: A Double-Blind Placebo-Controlled...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Conscious error detection is linked to autonomic activity, which declines with age, increasing
• error blindness.
• The causal relationship between autonomic changes and error blindness is unclear.

Purpose of the Study:

• To investigate if modulating autonomic responses affects conscious error detection in older adults.
• To explore the causality between autonomic reactivity and error blindness.

Main Methods:

• Thirty healthy older adults received atomoxetine or placebo in a double-blind, two-session study.
• An anti-saccade task assessed conscious error detection, with pupil dilation measuring autonomic response.
• A novelty-oddball task served as a manipulation check.

Main Results:

• Atomoxetine reduced pupil dilation to novel stimuli and errors, indicating autonomic response modulation.
• No significant differences in conscious error awareness were found between atomoxetine and placebo conditions.
• Primary task performance remained unaffected by atomoxetine.

Conclusions:

• Atomoxetine did not alter conscious error detection despite affecting autonomic activity.
• Phasic autonomic activity appears to be a consequence, not a cause, of conscious error awareness.
• Autonomic changes are unlikely to fully explain age-related increases in error blindness.