Alpha power

For alpha power, the interaction of time of day and flight was almost significant, F(5,44) = 2.4, p =. 052 HF, whereas the main effects flight, (F<1) and time, F (5,75) = 1.21,p =. 2877, were not significant Contrasts for the interaction showed that the alpha power was significantly smaller on the return flight... 

Subjective ratings and EEG parameters describe different dimensions of the multidimensional alertness phenomenon (Broughton, 1992). Alertness ratings show a smooth time course representing overall assessment of capacities, whereas alpha power in the EEG measures spontaneous dozing off and the susceptibility to sleep. 

As shown in Fig. 11.18, significant differences of Alpha power responses were observed in the C3 and 02 channels. Their mean of difference is over zero at 93%... 

Figure 11.18 Significant results of the Alpha power corresponding to Patterns 1.1 and 1.2.

Significant differences of Alpha power were observed at the C3 and Cz channels in the central sulcus, and at the 01 channel in the left of the occipital lobe as shown in Fig. 11.23. In the C3 channel, the mean of the difference is less than zero at 80% confidence level, which indicates that Pattern 2.1 triggered less Alpha power in the left of the central sulcus. However, in the Cz channel, the mean of the difference is over zero at 85% confidence level, which shows that Pattern 2.1 triggered higher Alpha power in the centre of the central sulcus. In the 01 channel, the mean of the difference is less than zero at 90% confidence level, which means that Pattern 2.1 triggered lower Alpha power than Pattern 3.2 in this brain location. 

Figure 11.23 Significant results ot the Alpha power corresponding to Patterns 2.1 and 2.2.

Significant differences of Alpha power response were also observed over the frontal lobe at the F3, Fz and F4 channels, the Cz and C4 channels in the central sulcus. 

Significant results of Alpha power were found in the Fp2 channel on the right of the prefrontal lobe, and the F3 and Fz channels in the frontal lobe, as shown in Fig. 11.35. The mean of the difference of these channels is less than zero at over 80% confidence level, which shows that Pattern 4.1 triggered lower Alpha power than Pattern 4.2 in these areas of the brain. 

In a placebo-controlled study in healthy women triptans had adverse nervous system effects, mainly mild sedative effects, which were less than sedation after temazepam 20 mg sumatriptan, but not rizatriptan, also caused a significant increase in the electro-encephalographic alpha power compared with placebo [14 ]. 

Figure 14-10. The increase in alpha power for younger and older drivers in light and heavy traffic as a function of time on task. The increase in alpha power was statistically significant only in the more monotonous light traffic condition (from Otmani et aL 2005, with permission from Elsevier).

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