Table 4.

Effects of subject position and time on cognitive performance in normative control subjects.

		PPB time (s)	RFT deviation (degrees)	Cube accuracy	Card time (s)	SOT-5M%
Group:a
Δ Supine	β	18.23	13.56			−
	p	<0.001	<0.001			−
Time:b
Δ N1	β			−9.40		7.40
	p			0.006		0.039
Δ N50	β
	p
Δ N90	β				−10.34
	p				0.033

^aDifference compaired to seated position; ^bdifference from N⁻¹²; PPB, Purdue pegboard test; RFT, rod and frame test; Cube, 3D cube rotation test; Card, 2D card rotation test; SOT-5M, sensory organization test 5 with head movement; BR, bed rest; β, parameter estimate; Note: no post hoc tests for interaction were significant; columns for the digit symbol substitution test, speed of the cube rotation task, accuracy of the card rotation task, the functional mobility test, and the senosry organization test 5 without head movement are not presented because none of the post hoc tests was significant.