Test of Reaction and Adaptation Capabilities (TRAC) will test the theory of brain adaptation during spaceflight by testing hand-eye coordination before, during and after the mission. This experiment is a collaborative effort between NASA and the Canadian Space Agency.Principal Investigator(s)
Canadian Space Agency (CSA), Ottawa, Ontario, Canada
Canadian Space Agency (CSA)Sponsoring Organization
Information PendingResearch Benefits
Information PendingISS Expedition Duration:
September 2006 - October 2007Expeditions Assigned
14,15Previous ISS Missions
ISS Expedition 14 is the first mission for TRAC.
The Test of Reaction and Adaptation Capabilities (TRAC) experiment will evaluate the theory that the decline of manual skills during spaceflight is a result of sensory-motor adaptation. The data that are collected will be used to provide evidence that the brain undergoes adaptive reorganization in microgravity which consumes resources that will be used for computational tasks leaving few resources for activities involving motor skills.
To test the theory of adaptation, the crewmember will test their hand-eye coordination prior to the mission, while in orbit and then again when the mission has concluded and they have returned to Earth. The Earth tests will provide the baseline for the on-orbit tests. The tests will be conducted in seven sessions occurring in one week intervals toward the end of the Increment.
The hardware that will be used includes a laptop computer that is mounted to a table and a joystick to control the cursor on the computer screen. Additionally, they will use audio headphones and a reaction time box to respond to audio and visual stimuli. The crewmember will be seated and secured to the floor of the US Lab module. The table will sit on the crewmember's legs when the test is performed.
Understanding how the brain adapts from zero-g to 1-g will lead to improvement in procedures that require precise motor skills.Earth Applications
The finds of this investigation may lead to improved medical treatments for patient who suffer from coordination deficits and neurological disorders on Earth.
Measurement will take place in the US Lab section of the ISS. The crew will be seated on the floor, restrained using a PERS strap around the waist. For the measurements, the crew will need a laptop, joystick, reaction time box, and headphones.
There will be seven sessions involving three ISS crewmembers. The sessions will occur in one week intervals towards the end of the Expedition. The crewmembers should not participate in physical exercise within 20 minutes of the start of each session.
ISS crewmembers will test their hand-eye coordination by using a computer program. The crewmembers will be secured to the floor of the US Lab module when the table with the TRAC hardware will be placed over their legs. For the test, the crewmember will use a joystick, attached to a laptop, to control a cursor that is displayed on the laptop screen. There will also be a reaction time box that will be used to measure the response to audio and visual cues.
Three (3) ISS crewmembers were repeatedly tested before, during, and after an extended mission on the International Space Station (ISS) during increments 14 and 15. The subjects performed an unstable tracking task at targets on a computer screen with a joystick and four reaction-time tasks with a 5-button box, both separately and concurrently.
The study found that the tracking error of the subjects on an unstable compensatory tracking task increased substantially, by a factor of about 2, from preflight to in flight both under single- and dual-task conditions. The dual-task costs with a reaction-time task requiring rhythm production was 2.4 times higher than with a reaction-time task requiring visual-spatial coordination, and 8 times higher than with a regular choice reaction-time task. In contrast to other studies, late data collection revealed that performance deficit persisted until the end the long-duration (5 to 6-month) mission. The authors proposed that this prolongation could be related to the unique stress levels ISS crewmembers experienced, and thus their ability to adapt to the space environment. It is quite conceivable that after prolonged microgravity, the human sensorimotor system reaches a new equilibrium which restores performance on everyday tasks, but not necessarily on experimental trials. This finding was interpreted as evidence that tracking deficits in space are not related to the scarcity of specific resources, but rather to an impaired handling of multiple simultaneous processing streams "costs of concurrence" as commonly observed under stress. Except for the tracking error, no other performance measure was reliably affected by space flight in this study.
The findings suggest that even after prolonged exposure to the space environment, subjects? hand-eye performance remains compromised in two ways. First, single-task tracking errors are higher than preflight, possibly due to elevated stress levels. Second, dual-task costs are higher specifically when complex motor programming is required, possibly due to ongoing space flight adaptation. Thus both phenomena, stress and adaptation, may contribute to cognitive overload during space flight. Following the mission, performance returned to preflight levels within days, suggesting that the effects of stress and adaptation are reversible (Bock et al., 2010).
Bock O, Weigelt C, Bloomberg JJ. Cognitive Demand of Human Sensorimotor Performance During an Extended Space Mission: A Dual-Task Study. Aviation, Space, and Environmental Medicine. 2010; 81(9): 819-824. DOI: 10.3357/ASEM.2608.2010.
Jungling S, Bock O, Girgenrath M. Speed-accuracy trade-off of grasping movements during weightlessness. Aviation, Space, and Environmental Medicine. 2002; 73: 430-435.
Bock O. Components of sensorimotor adaptation in young and elderly subjects. Experimental Brain Research. 2005; 160: 259-263.
Bock O, Abeele SS, Eversheim U. Sensorimotor performance and computational demand during short-term exposure to microgravity. Aviation, Space, and Environmental Medicine. 2003; 74: 1256-1262.
Eversheim U, Bock O. Evidence for processing stages in skill acquisition: A dual-task study. Learning and Memory. 2001; 8: 183-189.