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. Author manuscript; available in PMC: 2009 Jun 8.
Published in final edited form as: Neuroimage. 2005 Nov 21;29(2):368–382. doi: 10.1016/j.neuroimage.2005.08.065

Table 5.

Here, we show the probability of the null hypothesis (P values) for the correlation between the time-to-peak and magnitude of change of the various hemoglobin parameters

Time to
peak HbO		 Time to
peak HbT		 Time to
peak HbR		 Time to
peak BOLD		 HbO max
change		 HbT max
change		 HbR max
change		 HbO
integrated
area		 HbT
integrated
area		 HbR
integrated
area
Time to peak HbO -
Time to peak HbT ≪0.01 -
Time to peak HbR 0.02 0.02 -
Time to peak BOLD 0.02 0.03 0.02 -
HbO max change 0.10 0.08 0.34 0.39 -
HbT max change 0.75 0.66 0.91 0.99 <0.01 -
HbR max change <0.01 <0.01 0.02 0.04 0.03 0.48 -
HbO integrated area 0.12 0.10 0.23 0.25 ≪0.01 <0.01 0.01 -
HbT integrated area 0.54 0.47 0.74 0.73 <0.01 ≪0.01 0.31 <0.01 -
HbR integrated area <0.01 <0.01 0.02 0.03 0.06 0.63 ≪0.01 0.02 0.44 -

We found significant (P < 0.05) correlation between the latency of the response peak and the overall amplitude of the response for the HbR response. We also noted a similar trend for the HbO response, but the HbT response amplitude and timing seemed to be uncorrelated (P > 0.6). All ten subjects were used in this analysis.