Fixational eye movements predict the perceived direction of ambiguous apparent motion

Area of Science:

• Neuroscience
• Perception
• Oculomotor control

Background:

• Neuronal activity in the lateral intraparietal area (LIP) correlates with perceived motion direction.
• Eye movements, specifically microsaccades, are linked to cognitive processes.

Purpose of the Study:

• To investigate the relationship between microsaccades and the perception of ambiguous apparent motion.
• To determine if microsaccades play a role in perceptual decisions under ambiguous visual conditions.

Main Methods:

• Presenting ambiguous and unambiguous apparent motion stimuli to participants.
• Recording eye movements, focusing on microsaccades, during a motion discrimination task.
• Analyzing the temporal relationship between microsaccadic inhibition and perceptual reports.

Main Results:

• Microsaccadic inhibition (a decrease in microsaccade frequency) was observed before perceptual flips in ambiguous motion.
• This inhibition was specific to perceptual changes and not simple response alterations.
• The direction of pre-stimulus microsaccades influenced the perceived direction of ambiguous motion.

Conclusions:

• Microsaccades are involved in resolving perceptual ambiguity.
• Microsaccades may provide a neural signal that influences subjective perception when objective stimulus information is insufficient.