Intro ABR Flashcards
What is auditory evoked potentials (AEPs)
Bio electric activity in the auditory system that is stimulated or evoked by sounds
How can AEPs be elicited?
- Variety of Stimuli
Transient Clicks or Sustained Speech Sounds - Range of Intensities
Present threshold to Supra-threshold
How can AEPs stimuli being presented?
- Supra-aural headphones
- Insert earphones
- Bone vibrator
What happens next when AEPs are elicited?
Electrodes send this brain activity through wires to a system to interpret the information
List some clinical uses of AEPs
- Newborn Infants
- Difficult-to-test-children
- Patients with developmental disorders
- Patients with cognitive impairment
- Very sick patients
- Persons with false or exaggerated hearing loss
- Sleeping or unconscious patients
- Patients who are anesthetized or comatose
How can AEP be classified?
- Latency
- Transient
- Steady-state
- Sustained
- Amplitude
What is Latency?
Time between stimulus onset and response onset
Describe the latency for first, fast, middle, slow, and late:
Fast: 0-5ms - Compound Action Potential (CAP)
Fast: 1-15ms - Frequency Following Response (FFR)
Middle: 10-50ms - Middle Latency Response (MLR)
Slow: 30-500ms - Auditory Steady-State Response (ASSR)
Late: 200-1000ms - Mismatch Negativity (MMN)
Explain latency in relation to anatomic source
Shorter Latency = Caudal
Longer Latency = Rostral
Define Transient:
Occurs following a change in stimulus
Define Steady-State:
Falls in umbrella of sustain response since the response last as long as the sustain response and it’s steady-state because there’s changes in the stimulus
Define Onset:
As soon as something happens, there’s a change in the stimulus
Define Sustained:
Stimulus is of a certain duration and the response last for that certain duration
