Distinctive pupil and microsaccade-rate signatures in self-recognition.

Area of Science:

• Cognitive Neuroscience
• Ophthalmology
• Biometrics

Background:

• Pupil dynamics and fixational eye movements are involuntary processes crucial for visual perception.
• These eye measures are sensitive to cognitive and affective states.
• Understanding these responses can reveal underlying cognitive processes.

Purpose of the Study:

• To investigate how pupil dynamics and microsaccade rates are affected by self-recognition, familiar faces, and unfamiliar faces.
• To explore the potential of these physiological measures for identity validation.

Main Methods:

• A visual fixation experiment was conducted with 116 participants.
• Pupil size changes and microsaccade rates were recorded during face perception tasks.
• Stimuli included self-portraits, familiar faces, and unfamiliar faces.

Main Results:

• Pupil responses showed attenuated constriction and greater dilation for recognized faces, especially one's own face.
• Microsaccade rates exhibited stronger inhibition for familiar faces compared to unfamiliar faces, peaking with self-recognition.
• Distinct physiological patterns were observed for self, familiar, and unfamiliar face recognition.

Conclusions:

• Eye-related physiological measures can expose implicit knowledge within face memory.
• These findings suggest potential applications in biometric authentication and identity verification.
• Pupil dynamics and microsaccade rates offer a novel window into face recognition processes.