Shifted visual feedback of the hand affects reachability judgments in interception

Area of Science:

• Human-computer interaction
• Perception and motor control
• Robotics

Background:

• Estimating object reachability is crucial for interaction, especially with moving targets requiring temporal judgment.
• Visual feedback of hand position influences reachability judgments for static objects.
• The impact of visual feedback shifts on reachability judgments under temporal constraints (moving objects) is not well understood.

Purpose of the Study:

• To investigate how displaced visual feedback of hand position affects reachability judgments when intercepting a moving object.
• To determine if temporal constraints alter the influence of visual feedback discrepancies on spatial perception.

Main Methods:

• Participants intercepted a virtual cube with their unseen index finger upon judging it reachable.
• Visual feedback of the index finger's position was systematically shifted 5 cm closer to or further from the body.
• The perceived reachable region and spatial error at interception were recorded.

Main Results:

• The perceived reachable region was significantly larger when visual feedback was shifted away from the body compared to when shifted closer.
• This expansion of the reachable region correlated with the spatial error in interception.
• The results indicate a strong influence of visual feedback on spatial judgments, even with moving targets.

Conclusions:

• Judgments of surrounding space are adaptively adjusted based on shifted visual feedback of the hand.
• Displaced visual feedback significantly modulates the perception of reachability, particularly under dynamic conditions.
• Understanding these perceptual adjustments is vital for designing intuitive human-robot interaction and virtual reality systems.