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PPMV > Electophysiological Evaluation > Flashcards

Electophysiological Evaluation Flashcards

1
Q

This is known as an electrical potential which occurs in the cortex AFTER stimulation of a sense organ

A

Evoked Potential (i.e. SEP, ABR, VEP)

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2
Q

This records spontaneous brainwaves to ALL stimuli

A

Electroencephalogram (EEG)

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3
Q

This records brainwaves to a time-locked stimulus of interest (i.e. event). Electrodes are placed on the human scalp.

A

Event-Related Potential

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4
Q

What are the 4 goals of ERP?

A
  1. Amplification of response
  2. Filtering of potentials
  3. Segmenting response to each stimulus
  4. Averaging responses
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5
Q

Where are the electrodes placed to record the appropriate response at each location?

A
  1. Front
  2. Central
  3. Parietal
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6
Q

ERPs are used to index/assess the timeline ___ and ___ processing.

A

sensory and cognitive processing

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7
Q

The ERP response provides what 4 factors?

A
  1. Latency
  2. Amplitude
  3. Morphology
  4. Topography
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8
Q

This factor is the time to the first negative peak

A

Latency

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9
Q

This factor is the depth of the response (peak to peak)

A

Amplitude

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10
Q

this factor is how “nicely” the graph looks, how clear the signal was.

A

Morphology

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11
Q

This factor is where the specific activity occured.

A

Topography

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12
Q

What is the most clinically used ERP for audition?

A

ABR = auditory brainstem response

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13
Q

How many positive peaks are found in ABR? Latency?

A

5-7 positive peaks

8-10ms latency

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14
Q

This reflects the ability of the auditory nerve and pathway in the brainstem to detect sound.

A

Auditory Brain Response (ABR)

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15
Q

In this test, a patient hears a series of abrupt click sounds, bursts or phoneme.

A

ABR

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16
Q

Which peaks are crucial in ABR testing?

A

the first 5 peaks

17
Q

When is wave 3 formed in an infant?

A

at 6 weeks of birth

- after 1 year, signal response is like adults

18
Q

This indexes automatic detection of an auditory stimulus change; can be evoked by changes in tones, vowels and consonants; passive process

A

Mismatch negativity (MMN)

19
Q

This can be elicited from an oddball arrangement of stimuli, when the participant ignores the stimuli (subliminal attention)

A

Mismatch Negativity (MMN) - passive attention

20
Q

This is an important study in A.D.D patients

A

MMN

21
Q

This assesses detection and overt discrimination of an infrequent event; can be divided into P3a and P3b; active attention

A

P300

22
Q

This occurs to

  1. large differences in stimuli
  2. brief attention switch to variant,
  3. found whether participants are actively attending or not.
A

P3a

23
Q

This occurs when:

  1. Participants carry out discrimination task
  2. Particip. is actively attending stimuli
A

P3b

24
Q

This is elicited by an oddball paradigm; an unexpected stimulus in a series of expected stimuli

A

P300

25
Q

This measures changes in magnetic fields that accompany electrical activity; maps brain activity, neuroimaging

A

Magnetoencephalography (MEG)

- via an intracellular current

26
Q

This requires an injection of a positron-emitting radioactive isotope; short half-life, shows location in brain being used

A

Positron Emission Tomography (PET)

27
Q

This uses radio frequency information given off by water, allows fast acquisition of complete image slice in 20ms, uses radio frequency information given off by water, better time and spatial resolution

A

Magnetic Resonance Imaging (MRI)

28
Q

If a patient has a decrease in P300 latency, this means?

A

There’s an increase in cognitive capacity and attention skills

29
Q

A PET scan shows the ________

A

Shows the location of the brain being used, but not the function.

29
Q

What type of person is an ERP good for?

A

Useful for hard to test populations (non-verbal, impaired, infants)

PPMV (6 decks)

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