Table 1.

Talairach coordinates of the centers of mass of pixel populations activated during motor performance and motor imagery

Anteroposterior (y)Lateral (x)Superioinferior (z)
Precentral gyrus (anterior part)
MP (n = 12)−14.2  ± 2.229.4  ± 1.459.1  ± 0.9
MP + MI (n= 9)−14.0  ± 2.429.5  ± 1.459.2  ± 1.2
Precentral gyrus (posterior part)
MP (n= 11)−18.6  ± 1.831.8  ± 1.457.0  ± 0.8
MP + MI (n = 10)−18.2  ± 1.833.0  ± 1.256.7  ± 1.0
Postcentral gyrus
MP (n = 10)−24.7  ± 2.635.5  ± 1.456.6  ± 0.8
MP + MI (n= 8)−24.4  ± 3.035.6  ± 2.357.0  ± 1.0
  • All data (mean ± SEM, in mm) refer to the left hemisphere, contralateral to the actual or imagined hand movements. Population MP includes all pixels activated during real movement, whereas population MP + MI (corresponding to population A, see text) includes pixels activated during both actual movement and motor imagery. Only subjects displaying more than 4 activated pixels in each area were included in the analysis. y values represent distances from the vertical plane passing through the anterior commissure (negative values are posterior to this plane). x and z values represent distances from the vertical and horizontal planes passing through the anterior and posterior commissures (positive values being left and superior), respectively.