Which waves is predominantly seen in EEG with eyes closed in normal alert adult?
Correct Answer: Alpha waves
Description: Ans. A. Alpha wavesBandFrequency (Hz)Location NormallyDelta<4frontally in adults, posteriorly in children; high-amplitude waves* adult slow-wave sleep* in babiesTheta4-7Found in locations not related to task at hand* higher in young children* drowsiness in adults and teensAlpha8-15posterior regions of head, both sides, higher in amplitude on dominant side.* relaxed/reflecting* closing the eyesBeta16-31both sides, symmetrical distribution, most evident frontally; low-amplitude waves* range span: active calm - intense - stressed - mild obsessive* active thinking, focus, high alert, anxiousGamma>32Somatosensory cortex* Displays during cross-modal sensory processing (perception that combines two different senses, such as sound and sight)* Also is shown during short-term memory matching of recognized objects, sounds, or tactile sensations
Category:
Psychiatry
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now