Questions How does the human anatomy make it difficult to record an EEG? (0.5 pt
ID: 214260 • Letter: Q
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How does the human anatomy make it difficult to record an EEG? (0.5 pt)
What are common causes of the artifacts you recorded in Exercise 1? Name at least three causes. (0.75 pt)
In Exercise 2, under what conditions did you see alpha waves more clearly? (0.75 pt)
Exercise 1: Recognizing Artifacts In this exercise, you will learn to recognize some of the artifacts that can appear on an EEG Launch LabChart and open the settings file "EEG Settings" from the Experiments tab in the Welcome Center. It will be located in the folder for this experiment 1. 2. Select Bio Amp from the EEG Channel Function pop-up menu. It should be the only channel visible. Make sure the settings are as follows: Range 200 , High Pass 0.5 Hz, and Low Pass 50 Hz. Bio Amp lput 3: Bio Amp PowerLab 26T) Range: 200 Low pass: 50 Hz High Pass: 0.5 Hz 27.688 uv 200 150 100 50 DCRestore 50 100 150 -200 Mains flter invert Ant-alias Units... Pod Scan OK Cancel Figure 2. Bio Amp Dialog Start recording. Add a comment "blinking," and have the volunteer blink repeatedly. Stop recording after 10 seconds. 3. 4. Repeat step 3, this time, have the volunteer make eye movements. Add a comment "eye movements." Have the volunteer gaze up-and-down and left-and-right in a repeated pattern. Make sure the volunteer's head is still and only the eyes move 5. Repeat step 3, this time, have the volunteer make head movements. Add a comment "head movements." Have the volunteer gently move his/her head in a repeated pattern 6. Save your data, and open a new file with the same settingsExplanation / Answer
Human anatomy makes it difficult because electrodes have to read all of the parts of head and brain and it has to record from scalp, cerebrospinal fluid and skull and all of these results in small signals and that is how it becomes difficult.
2) Auditory and visual distractions were common causes of artifacts. Three causes can be other people distracting the subject, second can be thoughts they were having in their mind while experiment was going on and third can be the things happening outside like sound of vehicle can cause the artifects
3) Alpha waves were clearly seen when eyes were closed of the subject.
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