Embeddedness of Earth's gravity in visual perception

Area of Science:

• Cognitive Psychology
• Physics
• Visual Perception

Background:

• Accurate perception of falling objects is crucial for everyday tasks like interception and avoidance.
• Existing models struggle to fully explain how humans judge projectile motion, particularly under varying gravitational conditions.

Purpose of the Study:

• To investigate the role of internalized gravity in human visual perception of falling objects.
• To determine if perception is based on simple heuristics, representational momentum, or a combination of sensory data and physical predictions.

Main Methods:

• Controlled experiments were designed to meticulously manage the information available to participants observing falling objects.
• Participants' judgments of projectile motion were recorded under varying simulated gravitational conditions across four distinct experiments.

Main Results:

• Perceptual judgments of falling objects were not solely explained by simple heuristics or representational momentum.
• Results indicated that human perception is influenced by both immediate sensory information and predictive models of gravity.

Conclusions:

• Human perception of projectile motion relies on an interplay between sensory input and predictions constrained by internalized physical laws, specifically gravity.
• These findings underscore the significance of internalized physical constraints in shaping visual perception of dynamic events.