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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).