Psychophysics and computational modeling of feature-continuous motion perception.

Area of Science:

• Neuroscience
• Cognitive Science
• Perception

Background:

• Sensory decision-making often uses categorical tasks, despite continuous stimulus features.
• Continuous reports in perception studies can be affected by perceptual or motor biases.

Purpose of the Study:

• To examine perceptual and motor biases in continuous sensory reports.
• To compare two response methods for reporting motion direction.

Main Methods:

• Participants reported motion direction using a trackball (motor reference frame).
• Participants used a perceptual comparison stimulus (perceptual reference frame).
• Random dot kinematograms assessed biases across different sensory evidence levels.

Main Results:

• Strong, systematic biases were found with the motor reference frame, but not the perceptual reference frame.
• A consistent misperception of stimulus direction (confusing with opposite direction) was observed.
• A von Mises mixture model confirmed veridical perception, misperception, and guessing contributions.
• Perceptual performance, including precision, increased with sensory evidence using the perceptual method.

Conclusions:

• The choice of reference frame significantly impacts response biases in continuous perceptual tasks.
• A perceptual reference frame is less susceptible to motor biases than a motor reference frame.
• Continuous reporting methods, especially with a perceptual frame, offer sensitive insights into perception and performance improvements.