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Mass discrimination during prolonged weightlessness

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Science  13 Jul 1984:
Vol. 225, Issue 4658, pp. 219-221
DOI: 10.1126/science.6729479


Thresholds for mass discrimination under zero gravity in flight were found to be higher by a factor of about 1.8 than those for weight discrimination before flight. This suggests that humans are not as sensitive to inertial mass as they are to weight, and that adaptation can only partially compensate for loss of gravity. Weight discrimination thresholds were raised for 2 or 3 days after flight, suggesting an aftereffect of adaptation to weightlessness.