Early in the chapter, we emphasized the intimate relationship between brain activity and variations in consciousness. Check your understanding of this relationship by indicating the kind of EEG activity (alpha, beta, theta, or deltal that would probably be dominant in each of the following situations. The answers are in Appendix A. You have just fallen asleep.

EEG (Electroencephalogram) records electrical activity in the brain, and four major types of brainwaves can be identified: alpha, beta, theta, and delta. Let's review each type briefly: - Alpha waves: occur during relaxed wakefulness and are associated with a calm and relaxed state. They are found in the frequency range of 8-12 Hz. - Beta waves: occur during active wakefulness, concentration, and problem-solving. They are found in the frequency range of 12-30 Hz. - Theta waves: occur during light sleep, drowsiness, or meditative states. They are found in the frequency range of 4-8 Hz. - Delta waves: occur during deep sleep and are associated with restorative sleep. They are found in the frequency range of 0.5-4 Hz.

As the problem states "You have just fallen asleep," this would indicate the transition from a wakeful state to the initial stages of sleep. During this period of light sleep, theta waves are more likely to be dominant. Therefore, the dominant type of EEG activity in the given scenario would be theta waves.