Human sensitivity to acoustic information from vessel filling.

Area of Science:

• Auditory Perception
• Ecological Psychology
• Human-Computer Interaction

Background:

• The resonant frequency of a cylindrical vessel changes predictably as it fills with water.
• Auditory cues can provide information about the dynamic state of a physical environment.

Purpose of the Study:

• To investigate the use of auditory information for controlling the filling of a vessel.
• To determine if acoustic cues can support prospective control of filling, analogous to visual tau.
• To compare auditory-only control with multimodal control and assess performance in blind individuals.

Main Methods:

• Experiment 1: Observers identified changes in water level (rising, falling, static) based on sound.
• Experiment 2: Observers controlled vessel filling using only auditory cues, compared to multimodal conditions.
• Experiment 3: Blind and blindfolded sighted individuals filled vessels to the brim using auditory cues.
• Experiment 4: Sensitivity to acoustic time-to-full (TTF) was measured at various fill levels and rates.

Main Results:

• Observers reliably detected water level changes using sound.
• Auditory-only control was less effective than multimodal control but still functional.
• Blind and sighted individuals demonstrated accurate vessel filling based on acoustic information (R = .93 and R = .86, respectively).
• Sensitivity to acoustic time-to-full was high, with estimated TTF tracking actual TTF well (group R > .9, individual median R = .82).

Conclusions:

• Changing acoustic information provides a basis for adaptive, prospective control of vessel filling.
• Auditory perception is a viable sensory channel for guiding actions in dynamic environments, supporting ecological perceptual theory.
• The findings have implications for designing assistive technologies and understanding non-visual navigation and control.