Fundamental Neuroscience (Squire,Fundamental Neuroscience) by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9780123858719
Publisher: Elsevier Science
Published: 2012-12-16T22:00:00+00:00

Figure 25.19 Unit classification by “response map.” Shown are response areas for the five response types (types I–V) typically found in the cochlear nucleus. Response types are distinguished by the positions of their response areas: excitatory (green shading) and inhibitory (pink shading). Question marks show variable or uncertain areas. Type I neurons have excitatory response areas similar to the tuning curves of auditory nerve fibers. Type II neurons have similar excitatory areas and are inferred to have inhibitory flanking areas because they have little response to broadband signals like noise. Type III neurons have similar excitatory areas and definite inhibitory areas on either side. Type IV neurons have a small excitatory area at low levels (near the characteristic frequency), as well as a knife-sharp excitatory area at higher frequencies. Inhibition dominates much of the remainder of their response area. Type V neurons are similar to type IV neurons but lack a low-level excitatory area.

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