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Evoked Potentials Flashcards

7 cards from real EEG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Evoked Potentials flashcards as text

  1. Which cognitive evoked potential component is considered the gold standard for assessing auditory discrimination and working memory?

    Answer: P300 (P3b)

    The P300 (P3b) is an endogenous, task-related component elicited by target detection in an oddball paradigm, widely used to assess cognitive processing speed and memory.

  2. The N400 event-related potential is characteristically elicited by:

    Answer: Semantically incongruent words in a sentence

    The N400 is a negative deflection peaking ~400 ms that reflects semantic mismatch processing, elicited when a word violates the expected meaning of a sentence.

  3. Cortical somatosensory evoked potentials recorded over the scalp after median nerve stimulation include which early obligate component?

    Answer: N20

    N20 is the first cortical (primary somatosensory cortex) component of the median nerve SSEP, typically appearing ~20 ms post-stimulus in adults.

  4. Mismatch negativity (MMN) is unique among auditory evoked potentials because it:

    Answer: Can be recorded during sleep or in unresponsive patients

    MMN is a pre-attentive, automatic response to auditory change that can be recorded without voluntary attention, making it useful for assessing auditory discrimination in comatose patients.

  5. In VEP testing, what is the main reason each eye is tested separately with the other eye patched?

    Answer: To isolate each optic nerve's conduction independently

    Monocular testing isolates the optic nerve pathway anterior to the chiasm, allowing detection of unilateral demyelination or compressive lesions of a single optic nerve.

  6. Which BAEP wave is generated by the auditory nerve (cranial nerve VIII) and is commonly absent in acoustic neuroma?

    Answer: Wave I only

    Wave I is generated by the distal auditory nerve; its absence alongside preserved waves generated more centrally suggests a peripheral CN VIII lesion such as acoustic neuroma.

  7. Tibial nerve SSEPs are primarily used to monitor which spinal cord tracts during surgery?

    Answer: Dorsal column–medial lemniscus pathway

    Tibial nerve SSEPs ascend via the posterior (dorsal) columns carrying proprioception and fine touch, so they specifically monitor the dorsal column–medial lemniscal pathway.