Skip to main content
. Author manuscript; available in PMC: 2011 Jan 15.
Published in final edited form as: Neuroimage. 2009 Sep 25;49(2):1416–1431. doi: 10.1016/j.neuroimage.2009.09.044

Figure 8.

Figure 8

(A) Spectra recorded for 12 stimulus frequencies (Hz): 0.167, 0.083, 0.056, 0.042, 0.033, 0.025, 0.020, 0.017, 0.012, 0.010, 0.008 and 0.006 (in sec: 1/6, 1/12, 1/18, 1/24, 1/30, 1/40, 1/50, 1/60, 1/80, 1/100, 1/120 and 1/180). (B) PDI′ measured from panels A as a function of the stimulus frequency (from case 2, in logarithmic scale). Coloured points (red, green and blue) indicate PDI′s measured in area 18 of cases 4 to 6 at the same stimulus frequency (0.025 Hz). Yellow points are the measurements for the dynamic grating shown in Figure 3 (case 1, circle: counter-clockwise stimulation, square: clockwise stimulation). The mean (±SD) is indicated in the Figure. Gray points are the measures in area 21a shown in Figure 9 (case 3, frequency = 0.008 and 0.017 Hz). White points are measures in area 17 and 18 shown in Figure 9 for a 0.5 c/deg dynamic grating (case 1). (C) Spectral distribution of the HRF obtained from the second harmonic signals (shown in panels A) in a ROI (red box in inset). (D) Correlation coefficients between the normalized HRF profile of each pixel and the reference profile shown in panel C.