Chronotype and emotion processing: a pilot study testing timing of online cognitive bias modification training

Area of Science:

• Chronobiology
• Cognitive Psychology
• Behavioral Science

Background:

• Circadian rhythms significantly impact cognitive performance, with individual differences based on chronotype (early vs. late).
• The influence of chronotype on the effectiveness of cognitive interventions, such as cognitive bias modification (CBM), remains largely unexplored.
• Optimizing intervention timing based on individual biological rhythms is a potential avenue for enhancing treatment efficacy.

Purpose of the Study:

• To investigate whether the effectiveness of cognitive bias modification (CBM) for facial emotion processing is improved when delivered at a time-of-day synchronized with an individual's chronotype.
• To explore potential chronotype-by-timing interactions in the learning gains from CBM.

Main Methods:

• A pilot study involving 173 healthy young adults (aged 18-25) with identified early or late chronotypes.
• Participants completed one online session of CBM training, either in the morning (06:00-10:00) or evening (18:00-22:00).
• Training was delivered either synchronously (morning for early chronotypes, evening for late chronotypes) or asynchronously.

Main Results:

• Moderate evidence suggests participants achieved better learning outcomes (higher post-training balance point) when CBM training was delivered synchronously with their chronotype.
• This effect persisted after controlling for pre-training performance, sleep quality, and negative affect.
• A significant interaction revealed that late chronotypes learned faster and more effectively in synchronous conditions compared to asynchronous ones.

Conclusions:

• Preliminary findings indicate that chronotype synchrony effects apply to psychological interventions like CBM.
• Tailoring the delivery time of CBM training to individual chronotypes may optimize its effectiveness.
• This personalized timing approach could be particularly beneficial for late chronotypes, potentially mitigating challenges associated with social jetlag and improving adaptability to interventions.