Investigating the uncanny valley for prosthetic hands

Area of Science:

• Human-computer interaction
• Prosthetics design
• Perception psychology

Background:

• The uncanny valley hypothesis suggests stimuli imperfectly resembling humans evoke eeriness.
• This phenomenon has implications for the design of artificial limbs and robots.

Purpose of the Study:

• To assess the eeriness of various prosthetic hands.
• To determine if categorical ambiguity influences perceptions of eeriness.

Main Methods:

• Participants rated photographic images of prosthetic, mechanical, and real hands for eeriness and human-likeness.
• Speeded classification and location judgment tasks were employed to gauge categorization processes.

Main Results:

• Less human-like prosthetic hands (H-) were rated significantly more eerie than more human-like (H+) prosthetic, mechanical, and real hands.
• Categorization speed was slower for H+ prosthetic hands compared to H- prosthetic and real hands, indicating processing differences.

Conclusions:

• Prosthetic hands, particularly less realistic ones, can elicit uncanny valley responses.
• Eeriness perception is not solely driven by ambiguity in classifying hands as human or artificial.
• Increased realism in prosthetic design may mitigate the uncanny valley effect, though dynamic factors require further study.