Dysmorphic penis image perception: the root of Koro vulnerability. A longitudinal study

Area of Science:

• Psychiatry
• Psychology
• Medical Anthropology

Background:

• Koro is an acute anxiety reaction characterized by the belief of penile retraction.
• Previous research indicated Koro patients perceive smaller penis length than control subjects, irrespective of actual size.

Purpose of the Study:

• To investigate the influence of response bias on dysmorphic penis length perception in Koro patients.
• To assess the consistency of self-perceived penis length in individuals with Koro over time.

Main Methods:

• A longitudinal study design was employed.
• The Draw-a-penis Test, a graphomotor projective test, was administered to Koro patients three times over a two-year period.
• Objective penis length measurements were compared with patient perceptions.

Main Results:

• Koro patients demonstrated remarkable constancy in their perception of penis length throughout the study.
• The dysmorphic perception of own-penis length remained stable, suggesting a persistent cognitive bias.
• No significant correlation was found between objective penis size and perceived size.

Conclusions:

• The findings suggest that response bias significantly contributes to the distorted self-perception of penis length in Koro.
• The constancy of this perception highlights a core feature of Koro vulnerability.
• Further research is needed to understand the neurobiological and psychological underpinnings of this condition.