EEG Evoked Potentials

Question 1

What are the three main types of evoked potentials commonly recorded in a clinical neurophysiology laboratory?

Accepted Answer

Visual, Auditory, and Somatosensory

Answer

Motor, Sensory, and Cognitive

Answer

Cortical, Subcortical, and Peripheral

Answer

Pattern, Flash, and Click

Question 2

Which evoked potential modality is specifically used to assess the integrity of the auditory pathway from the cochlea through the brainstem?

Accepted Answer

Brainstem Auditory Evoked Potentials (BAEP)

Answer

Visual Evoked Potentials (VEP)

Answer

Somatosensory Evoked Potentials (SSEP)

Answer

Motor Evoked Potentials (MEP)

Question 3

What is the primary waveform of clinical interest in a pattern reversal visual evoked potential (VEP)?

Accepted Answer

P100

Answer

N75

Answer

N145

Answer

P200

Question 4

Stimulation of the median nerve in a somatosensory evoked potential (SSEP) study produces a cortical response designated N20 at approximately what latency in a normal adult?

Accepted Answer

18–21 ms

Answer

5–10 ms

Answer

12–15 ms

Answer

30–35 ms

Question 5

In brainstem auditory evoked potentials (BAEPs), Wave V is generated primarily by which structure?

Accepted Answer

Lateral lemniscus/inferior colliculus region

Answer

Cochlear nerve (CN VIII)

Answer

Cochlear nucleus

Answer

Primary auditory cortex

Question 6

Which measurement is most commonly used to identify BAEP abnormalities related to central conduction?

Accepted Answer

Interpeak latencies (IPLs) between waves

Answer

Absolute wave I latency alone

Answer

Peak-to-trough amplitudes

Answer

Stimulus intensity threshold

Question 7

What is the standard stimulus rate used when performing pattern reversal visual evoked potentials (VEPs) in a clinical setting?

Accepted Answer

1–2 reversals/second

Answer

0.1–0.5 reversals/second

Answer

5–8 reversals/second

Answer

10–15 reversals/second