Activity 2: Electroencephalography in a Human Subject UsingSPAC 1. List and defi

Question

Activity 2: Electroencephalography in a Human Subject UsingSPAC 1. List and define two characteristics of regular, periodic waveforms. 2. Examine the recordings of the alpha and beta waves for changes between "Eyes Open' and "Eyes Closed: Does the desynchronization of the alpha rhythm occur when the eyes are open? Explain. Does the beta rhythm become more pronounced in the "Eyes Open state? Explain. 3 Examine the wavedlengths for the delta and theta rhythms ls there an increase in delta and theta activity when the eyes are open? Explain. 4. Define the following: a. Alpha rhythm b. Beta rhythm c. Delta rhythm d. Theta rhythm Activity 3: Identifying the Meninges/Ventricles and Tracing the Flow of Cerebrospinal Fluid 1. Name the three meningeal layers from most superficial layer to deepest layer 2. State two functions of cerebrospinal fluid Identify ventricles and associated CSF passageways in the accompanying figure: 3. b. d. e.

Explanation / Answer

ACTIVITY 2

Ans 1) amplitude and frequency are the two characteristic of regular ,periodic waves. Amplitude is defined as the magnitude of the wave from maximum value achieved from the equilibrium position often value of 0.

Frequency is the number of waves observed in unit time.if this unit of time is 1 sec then frequency is measure in heartz.

Ans 2) alpha waves :- the normal electrical activity of the brain when eyes closed, conscious and relaxed, consisting of oscillation (alpha waves) 20-200mV.

Beta waves :-the normal electrical activity of the brain when conscious and alert, consisting of beta waves 4-8mV.

yes, alpha rhythms diminish when the subjects eyes are open and attentive to external stimuli. Although some subjects trained in relaxation can maintain alpha rhythms.

yes, beta rhythms increase when subjects eyes are open and attentive to external stimuli.

Ans 3) no, decrease in delta and theta rhythm when eyes are open because delta and theta waves are higher in the sleep state.

Ans 4) alpha rhythm :-the normal electrical activity of the brain when eyes closed, conscious and relaxed, consisting of oscillation (alpha waves) 20-200mV.

Beta rhythm :-the normal electrical activity of the brain when conscious and alert, consisting of beta waves 4-8mV.

Delta rhythm :-the normal electrical activity of the brain when a sleep 20- 200mV.

Theta rhythm :-a pattern of brain waves having a regular frequency of 4 to 8 cycles per second as recorded by an EEG. observed during various stages of light sleep or arousal.

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