Shots of a male subject having brain activity recorded on an electro-encephalograph. Shots of his EEG. Roberta Crawley introduces the programme. Roberta Crawley with a part of the EEG. She points o...ut an example of alpha blocking. Crawley gives a brief description of the EEG machine. Noel de M. Rudolph with an EEG machine. He explains how it works and how the electrodes are mounted on the subject. Rudolph points out and describes the alpha rhythm waves on the EEG machine. He then describes the system by which electrodes are placed on the head of a subject. He uses a diagram of the top of a human head as an aid. Rudolph then shows which EEG traces correspond to which points on the head Roberta Crawley introduces the sequence on the use of the EEG machine to monitor brain activity during sleep. Film sequence taken at the West London Hospital shows the electrical activity of a subject's brain during a night's sleep. Shots of subject's head being measured for electrode placement. Shots of some electrodes being put in place. Shots of Noel de M. Rudolph in studio demonstrating the placement of the electrodes which record eye movement. Shots of EEG showing eye movements on the tracing. Rudolph explains how the EEG machine picks up eye movements. Roberta Crawley briefly discusses the classification of stages of sleep. Return to film sequence taken at West London Hospital. The last electrodes are just being placed on the test subject's scalp. The test subject prepares for sleep and his electrical brain activity is being monitored on the EEG machine. Dr. David Glass explains the procedure as the experiment begins. Roberta Crawley provides some of the commentary. Stage one of sleep is shown on the EEG. Stage two of sleep is shown on the EEG. Glass and Crawley point out the characteristics of this stage. Stage three of orthodox sleep is shown on the EEG. Crawley and Glass point out its characteristics. Stage four of orthodox sleep is shown on the EEG. Crawley and Glass point out its characteristics. REM or paradoxical sleep is shown on the EEG. Crawley and Glass point out its characteristics. Roberta Crawley shows EEG examples for each stage of sleep and points out their characteristics. Return to film sequence taken at West London Hospital. Subject is in stage 2 of orthodox sleep and is awakened by a steadily increasing sound tone. The amount required to wake him is noted. Subject is now in REM sleep. He is again awakened by a sound tone and the level of sound required to wake him is noted. Subject reported dream activity during REM sleep and none during stage 2 orthodox. The level of sound required to wake him from REM sleep was 20% higher than for stage 2 orthodox. Roberta Crawley discusses the difference between REM and Stage 2 sleep- Roberta Crawley introduces the next experiment on alpha rhythm. Shots of Dr. Rudolph and test subject. The EEG of test subject is recorded. No alpha rhythm registers when subject's eyes are closed, (subject is drowsy) Test subject opens his eyes. Alpha rhythm reappears. Crawley sums up the above results. Alpha rhythm for the same test subject is monitored in an alert state. Alpha blocking appears on the EEG when eyes are shut. Crawley sums up this test. The same experiment is done again this time with a different subject. Different results are obtained. Crawley sums up and compares the results of the two experiments.
|Module code and title:
|SDT286, Biological bases of behaviour
|First transmission date:
|Restrictions on use:
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|Roberta Crawley; Noel de M'Rudolf
|BBC Open University
|Alpha blocking; Alpha rhythm; Brain activity; Dreams; Electro-encephalograph; REM sleep; Sleep
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