The document discusses three topics related to hearing: endocochlear potential, auditory brainstem response, and otoacoustic emissions. The endocochlear potential is a +80mV current generated by the striavascularis that provides energy for cochlear transduction. The auditory brainstem response involves waves that are recorded from various structures as sound travels from the cochlear nerves to the inferior colliculus. Otoacoustic emissions provide evidence of a healthy cochlea and can be spontaneous or evoked, making them useful for screening infants.

2. + 80 mV

3. generated from the striavascularis by Na+/K+ATPase pump and provides source of energy for cochlear transduction

4. Present at rest and do not require sound stimulation

6. EE COLI 1. Cochlear nerves - waves I and II 2. Cochlear nucleus - wave III 3. Superior olivary complex - wave IV 4. Nulclei of lateral lemniscus - wave V 5. Inferior colliculus - waves VI and VII

7. Otoacoustic Emissions Energy leakage Evidence of a healthy, functioning cochlea Spontaneous and evoked emissions Evoked emission seen only in cochleae with thresholds less than 20 to 30 dB Conductive losses affect emissions Screening tool in infants