Table 2.
Peak amplitude (% signal changes ± SD) of the BOLD HRF to different stimulus durations.
| 1 pulse 333 μs |
2 pulses 16 ms |
4 pulses 47 ms |
8 pulses 109 ms |
16 pulses 234 ms |
32 pulses 484 ms |
64 pulses 1 s |
128 pulses 2 s |
256 pulses 4 s |
|
|---|---|---|---|---|---|---|---|---|---|
| S1 | 1.3±0.4* | 1.4±0.2* | 1.4±0.3* | 1.6±0.2* | 1.8±0.3* | 2.1±0.4* | 2.4±0.3* | 2.6±0.5 | 2.8±0.4 |
| S2 | 1.2±0.2* | 1.3±0.1* | 1.5±0.3* | 1.7±0.4* | 1.9±0.3* | 2.2±0.3* | 2.5±0.3* | 2.7±0.4 | 2.8±0.3 |
| Caudate | 2.2±0.5* | 2.2±0.6* | 2.2±0.6* | 2.5±0.5* | 2.6±0.5* | 3.0±0.4* | 3.4±0.5 | 3.7±0.6 | 3.8±0.5 |
*
Significantly different from the response to a 256 pulse stimulus (P < 0.05, one-way ANOVA followed by Dunnet post hoc test)