invasive and noninvasive techniques

what components make up an extracellular recording electrode?

• Metal core, insulating layer, sharp tip exposed

• • Plastic core, insulating layer, dull tip exposed

• Metal core, conductive layer, sharp tip covered

• Plastic core, conductive layer, dull tip covered

Extracellular recording is predominantly used in which of the following?

• Human experiments only

• Animal experiments only

• Both animal experiments and increasingly in human subjects

• Neither animal nor human experiments

When is Multi-Unit Activity (MUA) used?

• • A. When isolating single neurons is possible

• • B. When isolating single neurons isn't possible

• • C. When recording synaptic potentials only

• • D. When recording from deep brain stimulation patients

Single-unit recording depends on which factors for signal strength?

• • A. Distance from the nucleus and axon size

• • B. Distance from the soma and neuron size

• • C. Distance from the axon and neuron size

• • D. Distance from the dendrite and axon size

What is a window discriminator used for in single-unit recording?

• • A. Enhancing signal strength

• • B. Isolating individual action potentials

• • C. Filtering out low-frequency signals

• • D. Measuring synaptic activity

What do raster plots represent in data presentation?

• • A. Voltage fluctuations over time

• • B. Each tick mark represents an action potential

• • C. Synaptic potentials over time

• • D. Average firing rate of neurons

Local Field Potentials (LFPs) are characterized by:

• • A. High-frequency electrical potential fluctuations

• • B. Low-frequency electrical potential fluctuations

• • C. High-frequency magnetic field fluctuations

• • D. Low-frequency magnetic field fluctuations

What filtering technique is used for obtaining LFPs?

• • A. High-pass filter

• • B. Band-reject filter

• • C. Low-pass or band-pass filter

• • D. No filter is used

Which type of electrode records from multiple cortical layers simultaneously?

• • A. Single wire electrodes

• • B. Laminar electrodes

• • C. Surface electrodes

• • D. Magnetoencephalography electrodes

What is the primary advantage of using tetrodes?

• • A. Records from a single neuron only

• • B. Better separation of signals from multiple neurons

• • C. Easier to insert into the brain

• • D. Provides larger signal amplitude