Reported thresholds of self-motion perception are influenced by testing paradigm

Area of Science:

• Vestibular Neuroscience
• Human Perception
• Sensory Integration

Background:

• Perceptual self-motion thresholds are crucial for understanding spatial orientation.
• Existing testing paradigms vary in the number of motion choices presented.
• Investigating the impact of paradigm choice on threshold measurement is essential.

Purpose of the Study:

• To compare the two-option and twelve-option paradigms for measuring self-motion perception thresholds.
• To determine if reducing choice options influences reported thresholds in healthy subjects.

Main Methods:

• Thirty-three healthy volunteers participated in a randomized crossover study.
• Self-motion perception thresholds were assessed using a hydraulic motion platform without visual or auditory cues.
• Participants identified movement types and directions from twelve possible options (six translations, six rotations).

Main Results:

• The twelve-option paradigm yielded significantly higher thresholds for yaw rotations and translations (left, right, down) compared to the two-option paradigm (p < 0.001).
• No significant differences were observed for roll rotations or upward translations.
• No significant gender, learning, or carry-over effects were detected.

Conclusions:

• The choice of testing paradigm demonstrably affects self-motion perception thresholds.
• Higher thresholds were reported with the twelve-option paradigm.
• Normative data must be specific to the testing paradigm used for accurate interpretation.