PHRM 211 Lecture Notes - Lecture 8: Non-Rapid Eye Movement Sleep, Electromyography, Muscle Tone
Document Summary
Definition : brainwaves produced by synchronized action potentials from ensembles of neurons that communicate with each other. Electroencephalogram (eeg) used to record moment-to-moment brain wave activity. Eeg activity within a given frequency band is also referred to as a brain rhythm . Definition : reversible behavioral state of peripheral disengagement from and unresponsiveness to the environment. Usually accompanied by postural recumbency, quiescence, closed eyes. Eeg activity : desynchronized (low voltage, high frequency waves) Eog activity : slows down, may show mild increase in stage iv. Eeg activity : gradually becomes synchronized (high amplitude, low-frequency waves) Nrem sleep is characterized by a relatively inactive, yet actively regulating brain in a moveable body . Emg activity : abolished, muscular atonia opposite to that during awake state. Eeg activity : becomes desynchronized again (low amplitude, high-frequency waves) Can be further subdivided into tonic and phasic episodes. Tonic episodes display little eye movements and atonia.
