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Table 1 Descriptive statistics for n = 20 subjects.

From: Different strategies do not moderate primary motor cortex involvement in mental rotation: a TMS study

 

Shepard & Metzler fig.

Houses

Tools

Hands

2-D figures

Mean baseline

Mean MEP amplitudes [μV]

732.64

731.47

785.21

629.37

802.30

496.65

SD MEP amplitudes [μV]

518.52

535.86

563.90

521.31

613.79

361.70

Mean reaction times [ms]

3115

3217

2381

1869

1981

-

SD reaction times [ms]

428.24

280.50

449.62

439.97

304.97

-

Mean number of errors

7.75

5.15

2.55

0.95

0.80

-

SD number of errors

3.06

2.72

1.85

1.23

0.89

-

Mean ranking difficulty

4.70

4.20

2.70

1.75

1.65

-

SD ranking difficulty

0.57

0.52

0.80

0.72

0.75

-

Frequency use of internal strategy

0.50

0.40

0.75

1.40

0.50

-

SD use of internal strategy

1.05

1.00

1.33

1.70

1.28

-

Frequency use of external strategy

3.45

3.50

3.25

2.75

3.50

-

SD use of external strategy

1.10

1.00

1.25

1.65

1.24

-

  1. MEP = motor evoked potentials; SD = standard deviation; recording of MEP amplitudes in first part, reaction times and errors in the second part of the experiment; ranking difficulty was forced-choice ranking: from 5 = "hardest" to 1 = "easiest"; frequency use of strategy refers to internal and external strategies described by Kosslyn et al. [3] assessed by post hoc rating questionnaire from 0 = "never used" to 4 = "always used" (the mean rating is reported here).