Touch down: the effect of artificial touch cues on orientation in microgravity

Area of Science:

• Neuroscience
• Human Physiology
• Aerospace Medicine

Background:

• Spatial orientation on Earth relies on integrating visual, vestibular, and pressure cues.
• Microgravity environments lack gravitational cues, challenging astronauts' sense of up and down, potentially causing space motion sickness.
• Previous research highlighted natural touch cues (e.g., foot pressure) for orientation, but the brain's integration of artificial cues remained unexplored.

Purpose of the Study:

• To investigate if artificial touch cues can aid spatial orientation in microgravity.
• To determine if the brain can integrate artificial orientation information without real-world equivalents.
• To assess the impact of artificial touch cues on astronauts' ability to orient themselves in space.

Main Methods:

• An astronaut performed three tasks aboard the International Space Station (ISS).
• Artificial touch cues, specifically localized vibrations on the torso indicating "down," were presented.
• The study examined the effect of these artificial cues on spatial orientation over the initial 7 days in microgravity.

Main Results:

• Artificial touch cues significantly improved the speed, accuracy, and ease of spatial orientation in microgravity.
• The influence of artificial touch information appeared to grow over the first 7 days in space.
• Conversely, the reliance on visual information for orientation decreased during the same period.

Conclusions:

• The brain demonstrates a remarkable capacity to adapt to novel environments and integrate artificial sensory information.
• Artificial tactile feedback can enhance spatial orientation in microgravity, offering a potential countermeasure for disorientation.
• This technology holds promise for improving the experience and safety of astronauts, pilots, divers, and individuals with vestibular disorders.