Explain The Advantages And Disadvantages Of Using EEG/ERP Over fMRI, PET And TMS

May 10, 2021 | Uncategorized

Biopac Student Laboratory V4.1                     Lessons 3 & 4: EEG I & 2                                 PSY2006

 

ELECTROENCEPHALOGRAPHY

EEG I and EEG II

 

N.B. Please complete this pro-forma in your own words and upload via the TurnItIn link on Unihub. Each question includes a guide for how long the answer is expected to be.

 

Student number:  M0062340p

File names used:  EEG – Macie J and EEG2 – Macie J

Date/time of lab class: Monday 18 November – 1-3pm

 

  1. Data and Calculations

Participant’s details:                                                               Age: 21  Sex: M

Lesson 03 Data Report: EEG I

  1. EEG Amplitude Measurements

Table 3.2 Standard Deviation [Stddev]

Rhythm Channel Eyes closed Eyes open Eyes Re-closed
Alpha 7.85 3.86 7.89
Beta 3.22 2.35 3.24
Delta 5.62 4.40 5.04
Theta 6.25 3.48 5.82

 

  1. EEG Frequency Measurements from first ‘Eyes closed’ data.

Complete Table 3.3 with the frequencies for each rhythm and calculate the mean frequency. Freq measurement applies to all channels since it is calculated from the horizontal time scale, but you must select the correct area in each band.

Table 3.3 Frequency (Hz)

Rhythm Channel Cycle 1 Cycle 2 Cycle 3 Mean
Alpha 9.52 9.52 9.52 9.52
Beta 15.38 18.18 20 17.85
Delta 4.08 5.13 5.26 4.82
Theta 6.45 7.40 7.69 7.18

 

  1. Questions – Lesson 03
  2. Define what is meant by the following terms in the context of EEG:
  3. Frequency [1-2 sentences]                                   b. Amplitude   [1-2 sentences]

 

  1. Examine the alpha change between the “eyes closed” state and the “eyes open” state. Does desynchronization of the alpha rhythm occur when the eyes are open? Explain your answer. [1-2 sentences]
  2. How does event-related change in alpha relate to attention? Support your answer with empirical evidence. [100-200 words]
  3. Examine the delta and theta rhythm. Is there an increase in delta and theta activity when the eyes are open? Explain your observation. [100-200 words]
  4. Examine Table 3.3. Does the mean value of Delta agree with expected values? Yes/No? Explain your answer. [1-2 sentences]
  5. Briefly define the following terms and list one cognitive process associated with each frequency band (provide empirical references to support your answers)
  6. Beta rhythm [1-2 sentences]
  7. Theta rhythm [1-2 sentences]

iii. Gamma rhythm [1-2 sentences]

Lesson 04 Data Report: EEG II

Amplitudes

  1. Complete Table 4.1 with the amplitudes of the recorded data in the control and experimental conditions. Calculate the difference for the Alpha-RMS Mean between the Experimental Conditions and the Control.

Table 4.1 Amplitudes

Condition

Raw EEG

Alpha

Alpha RMS

Alpha RMS difference
  Expt. minus  Control value
Eyes closed (control) 10.88 8.23 1.69  
Mental arithmetic 10.45 8.19 1.70 0.01
Recovery from hyperventilation 11.79 8.27 1.69 0
Eyes open 7.09 3.26 0.62 -1.07

 

Frequency

  1. What is the frequency of an alpha rhythm from “Eyes closed” data?  = 8.70Hz

III. Questions – Lesson 04

  1. Refer to Table 4.1: When was the general amplitude of the EEG highest? Why is this? [1-2 sentences]
  2. Refer to Table 4.1: How do your results compare with the information presented in the Biopac Introduction? Explain any discrepancies. [100-200 words]
  3. What are the advantages and disadvantages of using EEG/ERP compared to other neuroscientific techniques such as fMRI, PET and TMS? [100-200 words]
  4. Define ‘frontal EEG asymmetry’ and critically evaluate the relationship with individual differences of either depression OR anxiety. Make sure that you cite and reference all sources.[500 words]Reference list

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