The observer's perspective determines which cues are used when interpreting pointing gestures.

Area of Science:

• Cognitive psychology
• Human-computer interaction
• Visual perception

Background:

• Pointing gestures are fundamental to human communication but prone to misinterpretation.
• Understanding how observers perceive pointing direction is crucial for effective interaction.

Purpose of the Study:

• To investigate the influence of observer perspective on the perception of pointing gestures.
• To test the hypothesis that pointing perception relies on visual cues (arm vector, finger position) and their relative importance varies with observer viewpoint.

Main Methods:

• Three experiments were conducted using virtual and real pointing gestures.
• Participants judged pointing locations from various observer perspectives.
• Data analysis focused on the interplay between observer viewpoint and reliance on different visual cues.

Main Results:

• Observer perspective significantly affects pointing perception.
• Increased alignment between observer gaze and pointing arm leads to greater reliance on finger position in the visual field.
• Conversely, reduced alignment decreases reliance on finger position and increases reliance on the pointing arm's vector.

Conclusions:

• The observer's perspective is a critical factor in interpreting pointing gestures.
• The relative weighting of visual cues in pointing perception is dynamically adjusted based on the observer's viewpoint.
• Findings have implications for designing intuitive interfaces and understanding human-human communication.