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Pupillary Responses to Dot Patterns on a Human Face Background.

Nanxin Song¹, Shinichi Koyama¹

¹Institute of Art and Design, University of Tsukuba, Ibaraki 305-8574, Japan.

Behavioral Sciences (Basel, Switzerland)

|January 26, 2024

Summary

This summary is machine-generated.

Dots on faces may elicit disgust, not fear, as indicated by pupil responses. Pupillary constriction to dots on faces did not significantly differ from controls, but recovery was faster.

Keywords:

HASU-COLLA disgust dot patterns pupillometry trypophobia

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Area of Science:

Psychology
Neuroscience
Physiology

Background:

Dots on natural backgrounds trigger pupillary constrictions linked to parasympathetic activation, suggesting disgust.
While dots on faces are known to evoke stronger disgust than on non-face backgrounds, direct comparison of pupil constriction remains unclear.

Purpose of the Study:

To investigate if dots on faces elicit stronger pupillary constrictions compared to non-face backgrounds.
To explore the role of parasympathetic and sympathetic nervous system activity in response to dots on faces.

Main Methods:

Pupillometry was employed to measure pupil size changes.
Participants viewed dots presented on faces, phase-scrambled faces (luminance and spatial frequency controlled), and face-only stimuli.

Main Results:

Initial pupillary constrictions were observed for dots on faces and phase-scrambled faces, but without significant differences compared to controls.
Pupillary responses to dots on faces recovered to baseline faster than those on phase-scrambled faces, with a larger pupil size in the later phase.

Conclusions:

The findings suggest that dots, irrespective of the background, may activate the parasympathetic nervous system, potentially eliciting disgust rather than fear.
The dynamic interplay between sympathetic and parasympathetic activities might explain the observed differences in pupillary response recovery and size.