LT8A - FMRI's + EEG's

LT8A - FMRI's + EEG's

1. AO1

   • EEGs (Electroencephalograms)
     • Measures general electrical activity
       • Electrodes (12-100+) Put on scalp
         • Detect neuronal activity directly below placement
       • Detect small electrical charges from activity of brain cells in cerebral cortex
     • When graphed over time, produce brainwave patterns of thousands of neurons
     • Amplitude
       • Strength of wave
     • Frequency
       • Quantity of activation
     • Useful in diagnosing arrhtymical conditions EG Epilepsy
     • Shows brain activity during sleep Vs learning
     • Alpha
       • Beta
         • Theta
           • Delta
             • Deep sleep
           • Light sleep
         • Physiologically aroused, REM Sleep
       • Awake, relaxed
   • FMRIs (Functional Magnetic Resonance Imaging)
     • Radio Waves, nagnetic fields, monitors changes in blood oxygenation and flow
       • More active brain?
         • Increased Oxygen demand
           • More bloodflow
             • delivers oxygen attached to haemoglobin found in RBC's
       • Dynamic moving images
         • Shows which parts are active
           • Vital for localisation
     • Activity in regions on interest
       • Compared to baseline
         • Face recognition, memory, feelings

2. AO3

   • EEG's
     • Strengths
       • P: Good temporal resolution
         • E1: Millisecond readings
           • L: Accurate measurement, real-world usefulness
       • Cost Effective on the fly
       • Practical Applications
         • EEgs om nraom dosease slower electrical activity
           • helps in clinical diagnosis
     • Weaknesses
       • P: Poor spatial resolution
         • E1: electrical acitivity detected from neighbouring electrodes
           • E2: Difficukt ti pinpoint source
             • L: Problems with generalised nature of data, distinguishing between activities in diff but closely adjacent locations
   • FMRIs
     • Strengths
       • P: Good spatial resolution
         • E1: Depict detail to 1-2mm, greater than other techniques
           • E2: Precisely identify active brain regions and patterns of activation over time whilst Ps complete experiment
             • L: Clear, localisation to millimetre
     • Weaknesses
       • P: Poor temporal resolution
         • E1: 4 Second Time lag, initial neural firing
           • E2: Worse than EEGs/ERPs, 1-10 ms
             • L: Can't truly represent moment to moment brain activity