20_BrainRhythms - Bear: Neuroscience: Exploring the Brain...

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Slide 1 Bear: Neuroscience: Exploring the  Brain 3e Chapter 19: Brain Rhythms Note: Because of time constraints, this lecture will focus on brain waves and circadian rhythms only. The topic of sleep will be omitted.
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Slide 2 Introduction Rhythmic Controls of Brain Sleeping and waking, hibernation,  breathing, walking, electrical rhythms of  cerebral cortex Cerebral cortex: Range of rapid electrical  rhythms EEG: Classical method of recording brain  rhythms Circadian rhythms: Change in physiological  functions according to daily clocks in brain
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Slide 3 The Electroencephalogram The Electroencephalogram (EEG) Measurement providing glimpse of  generalized activity of cerebral cortex Function Diagnose neurological conditions such as  epilepsy, research purpose Richard Caton in 1875, electrical recordings  from surface of dog and rabbit brains using  primitive device sensitive to voltage Hans Berger in 1929, human EEG
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Slide 4 Recording Brain Waves  Electrodes to scalp, low-resistance  connection Connected to banks of amplifiers and  recording devices Voltage fluctuations measured (tens of  microvolts) Electrode pairs: Measure different brain  regions Set of simultaneous squiggles, voltage  changes between electrode pairs The Electroencephalogram
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Slide 5 EEG Fluctuations and Oscillations The Electroencephalogram
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20_BrainRhythms - Bear: Neuroscience: Exploring the Brain...

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