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Related Experiment Video

Updated: May 9, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

Basic instinct undressed: early spatiotemporal processing for primary sexual characteristics.

Lore B Legrand¹, Marzia Del Zotto, Rémi Tyrand

¹Laboratory of Experimental Neuropsychology, Neuropsychology Unit, Neurology Clinic, Geneva University Hospitals, Geneva, Switzerland.

|July 30, 2013

Summary

This summary is machine-generated.

The human brain processes naked bodies and sexual features rapidly, even unconsciously. This rapid processing activates visual and emotional brain areas, suggesting evolutionary importance for survival and reproduction.

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Area of Science:

Neuroscience
Cognitive Psychology
Human Sexuality

Background:

Understanding the neural underpinnings of visual processing.
Investigating the impact of stimulus nudity and sexual characteristics on brain activity.
Differentiating between conscious and non-conscious perception.

Purpose of the Study:

To explore the spatiotemporal brain dynamics of processing naked versus dressed human bodies.
To determine if conscious awareness influences the neural response to sexual stimuli.
To identify brain regions involved in processing nudity and sexual features.

Main Methods:

High-resolution electroencephalography (EEG) data acquisition from 20 participants.
Presentation of naked and dressed body stimuli under supraliminal and subliminal (backward masking) conditions.
Analysis of N1 event-related potential component and source localization.

Main Results:

Naked bodies elicited a stronger N1 component than dressed bodies under conscious viewing.
Naked bodies of the opposite sex showed a greater N1 response even during non-conscious presentation.
Source localization indicated activation in visual, body, and emotion processing areas.

Conclusions:

Naked bodies and primary sexual characteristics are processed rapidly (<200 ms) and activate key brain structures, even without conscious detection.
Sexual features appear to benefit from automatic, rapid processing, similar to emotional faces.
This rapid processing is likely linked to evolutionary relevance for reproduction.