_EEG assignment 6

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School

Carleton University *

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3206

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Electrical Engineering

Date

Jan 9, 2024

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docx

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Lab 6: EEG Assignment Total: /40 Instructions: Your lab assignment must be completed and submitted via Brightspace, along with your data file, one week after your lab session. Note: In order to analyze your data and complete the assignment, you will need to download the LabChart software. Instructions are in the “LabChart Software Download Instructions” document. Eyes closed condition 1. Using the labchart software, choose a portion of the eyes closed condition and measure the trough to peak amplitude of 5 successive waveforms, their respective periods, and the frequency of the 5 waves. Include a screenshot of your trace used to complete the table, along with an appropriate figure caption. (10 marks) Wave 1 Wave 2 Wave 3 Wave 4 Wave 5 Average Peak to trough amplitude 60.6 61.6 69.8 65.6 56.1 62.74 Period 0.0875 0.1075 0.09 0.1075 0.1025 0.099 Frequency 11.4 9.30 11.11 9.30 9.75 3.81 Figure 1: EEG signal with eyes closed. 2. Based on what you know about EEG waveforms, are your waveforms (overall average) within your data consistent with the experimental condition (i.e., eyes closed)? Explain. (2 marks) Yes, the waveforms within the data are consistent with the experimental condition as the peak to trough is within 75 uV, and the frequency is within 8-13 Hz.

Lab 6: EEG Assignment Eyes open condition 3. Using the labchart software, choose a portion of the eyes open condition and measure the trough to peak amplitude of 5 successive waveforms, their respective periods, and the frequency of the 5 waves. Include a screenshot of your trace used to complete the table, along with an appropriate figure caption. (10 marks) Wave 1 Wave 2 Wave 3 Wave 4 Wave 5 Average Peak to trough amplitude 18.6 29.5 23.2 21.1 19.8 22.46 Period 0.1025 0.045 0.11 0.11 0.05 0.0835 Frequency 9.75 22.2 9.09 9.09 20 14.026 Figure 2: EEG signal with eyes open 4. Based on what you know about EEG waveforms, are your waveforms (overall average) within your data consistent with the experimental condition (i.e., eyes open)? Explain. (2 marks) Yes, the waveform within the data are consistent with the experimental conditions as the peak to trough is less than 30 uV and the frequency is above 13 Hz. Spectral Analysis

Lab 6: EEG Assignment 5. Using the instructions laid out in Exercise 3 of the protocol, make a PSD plot and spectrogram for both eyes closed and eyes open conditions (see figure 8 of the protocol as a guide). For each condition, post a screenshot of each plot for both conditions with an appropriate figure caption that details the experimental condition and the frequency and power of the predominant EEG waves (i.e., you should have 4 screenshots and 4 figure captions). (6 marks) Figure 3: Spectral Analysis of eyes closed condition Frequency: 10.156 Hz Power: 843. 870 pv^2 Figure 4: Spectral Analysis of eyes open condition Frequency: 9.766 Hz

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Lab 6: EEG Assignment Power: 20.854 pv^2 6. In reference to question 5, explain what the frequency and power of an EEG wave are in layman's terms. (2 marks) The frequency of an EEG wave is the rate at which the signal oscillates (1/ period of the wave) and the power of an EEG wave is the amplitude of the signal ( peak to trough). General questions 7. What do you think would happen to alpha wave activity if you were to perform mental math? What would happen to alpha wave activity if you were in a deep meditative state? Explain your reasoning. (3 marks) The alpha wave activity would decrease if one were to perform mental math. This is because mental activities require attention and focus, therefore it’ll suppress the alpha wave activity that is associated with calm relaxed states. The alpha wave activity would increase if one were in a deep meditative state. 8. Besides the artifacts measured in the lab, discuss 2 other sources of possible artifacts. (2 marks) External electrical interferences from electronic devices or if there were loose electrodes or movement of electrode wires could result in artifacts. 9. In this experiment, the experimental subject had the negative and ground electrodes placed on their forehead, and the positive electrode placed just above their inion. What would happen to the signal if you had flipped the negative and positive electrodes? (2 marks) If the negative and positive electrodes were flipped, it would affect a different part of the brain and the waves will be inverted. 10. If you had access to a full EEG cap and an expert to help you conduct any study of your choosing, describe an experiment you would be interested in running. (1 mark) If i had access to a full EEG cap and an expert to help me, I would probably run an experiment that investigates the neural activity of how distractions work.