Fox squirrel (Sciurus niger): The fox squirrel is the largest tree squirrel in Illinois, weighing one and three-quarters to two pounds with a length of 19 Â½ to 22 inches. The fur is a mix of rusty-yellow with black with an overall reddish cast. The fur on the ears, belly, and edge of the tail is lighter.
Audiologists are able to measure the speed and intensity of these pulses to determine if there is hearing loss or a lesion that is upsetting the flow of the sound information through the brainstem. This measurement is called a brainstem auditory evoked response (BAER).
Auditory Brainstem Response Testing. Auditory brainstem response (ABR) testing may be ordered following a basic hearing test to further evaluate the status of the hearing nerve and brainstem pathways that conduct sound from the inner ear to the brain. In rare cases, the neural pathways may not conduct sound normally.