Fast saccades toward faces: face detection in just 100 ms

Area of Science:

• Cognitive neuroscience
• Visual perception

Background:

• The human visual system efficiently detects animals in natural scenes.
• Previous research shows saccades toward animals are initiated within 120-130 ms.

Purpose of the Study:

• To investigate the speed of saccade initiation toward human faces.
• To determine if face detection is automatic and independent of task instructions.
• To examine if rapid saccade responses occur in different visual field presentations.

Main Methods:

• Utilized a saccadic choice task with simultaneous image presentation.
• Measured earliest reliable saccade onset and mean reaction times.
• Paired face images with vehicle images to test instructional control.
• Presented images in both horizontal (left/right) and vertical (above/below) visual fields.

Main Results:

• Saccades toward human faces were initiated faster (100-110 ms) than toward animals.
• Fast saccades were biased toward faces even when participants were instructed to target vehicles.
• Rapid saccade responses were observed regardless of whether images were presented horizontally or vertically.

Conclusions:

• Face-selective behavioral responses are extremely rapid.
• Very fast saccades toward faces appear to be largely automatic and not fully under instructional control.
• These findings place significant constraints on models of visual processing and rapid response generation.