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Cardiac Dynamics During Social Evaluative Feedback: Evidence from Intersubject Representational Similarity Analysis.

Jinhee Kim¹, Meeseung Lee¹, Daon Lee¹

¹School of Psychology, Korea University, South Korea.

Biological Psychology

|May 3, 2026

Summary

Social feedback influences defensive reactions. This study found heart rate patterns reveal individual differences in self-protection, linking cardiac activity to behavioral biases in social evaluations.

Keywords:

behavioral bias cardiac deceleration heart rate variability intersubject representational similarity analysis social feedback

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Area of Science:

Psychology
Neuroscience
Physiology

Background:

Social evaluative feedback often triggers individual defensive responses.
Understanding the psychophysiological mechanisms behind these variable responses is crucial.
Self-protective behaviors in social contexts require investigation into their physiological underpinnings.

Purpose of the Study:

To investigate the cardiac correlates of defensive responses to social feedback.
To explore how heart activity variability relates to individual differences in self-protective behavior.
To elucidate the physiological basis of self-protective bias in social interactions.

Main Methods:

A mobile-based artwork evaluation task was used with continuous cardiac monitoring via photoplethysmography (smartwatch).
Participants received positive, negative, or neutral feedback and then evaluated partner artwork.
Temporal intersubject representational similarity analysis (IS-RSA) analyzed cardiac activity patterns and behavioral data.

Main Results:

Social feedback significantly impacted subsequent artwork evaluations.
Negative feedback led to transient heart rate deceleration, linked to lower resting heart rate variability.
Greater cardiac similarity post-feedback correlated with favorable judgments after positive feedback, indicating bias.

Conclusions:

Individual psychophysiological variability plays a key role in social self-protection.
Heart rate dynamics during social feedback reflect self-protective behavioral biases.
This study clarifies the physiological basis of defensive reactions in social evaluations.