Mathematisch-Naturwissenschaftliche Fakultät - Jahrgang 2008

Titel

Autor

Ramadan Ali

Publikationsform

Dissertation

Abstract

Lateral line units in the MON of goldfish exhibited phasic or tonic responses to constant-amplitude stimuli. When stimulated with amplitude-modulated stimuli, most MON units exhibited phasic-tonic or tonic responses that were phase-locked to the modulation frequency. On average, phase-locking to the modulation frequency was greater than phase-locking to the carrier frequency. Thus, MON responses to amplitude-modulated sine wave stimuli differed from those of afferent fibres in the posterior lateral line nerve (strong phase-coupling to both carrier and modulation frequency) and were similar to those of midbrain lateral line units (strong phase-coupling only to the modulation frequency).
When modulation depth was maximal (96%), units responded to each modulation cycle with about the same number of spikes. When modulation depth was less than maximal, units tended to discharge with a decreasing number of spikes to increasing numbers of AM cycles. When modulation depth was 24% or smaller, discharge patterns resembled the responses to unmodulated CFs, i.e. units responded with an on-response to the first AM cycle but responded only weakly to successive AM cycles.
Lateral line units in the MON of goldfish increased their discharge rates and the degree of phase-locking with increasing displacement amplitudes of the vibrating sphere.
Most level response functions were steep, i.e., discharge rates increased over a narrow range of displacements (50 μm to 175 μm).
Goldfish medullary lateral line units encode a wide range of stimulus displacements.

Komplette Version

pdf-Dokument (8 MB!)

In Teilen

Inhaltsverzeichnis
Teil 1. Seiten 1 - 36 (4,5 MB)
Teil 2. Seiten 37 - 79 (3,5 MB)