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The turning responses of clawed toads (Xenopus laevis) to surface waves were examined in animals with an intact lateral line or with different combinations of lateral lines reversibly inactivated by CoCl2. The responses were characterized with respect to response frequency, turning accuracy, turning side, response time, and swim distance. After the(More)
Following lateral line stimulation with surface waves single unit activity was recorded from the periphery, torus semicircularis, and tecturn opticum ofXenopus laevis. The reaction of units to varying stimulus directions was examined. The directional specificity (DS) was calculated on the basis of spike counts per stimulus using circular statistics. It was(More)
The influence of neural activity on the morphology of retinal-axon-terminal arbors and the precision of the developing retinotectal projection in zebrafish embryos was explored. Terminal-arbor morphology and their distribution in the tectum was determined with anatomical fiber-tracing methods using the fluorescent dyes dil and diO. To allow development(More)
The turning response to surface waves of clawed toads (Xenopus laevis) with an inactivated lateral line was reinvestigated to examine whether sensory systems other than the lateral line (“second systems”) are involved. Two methods were used to block the lateral line input: selective and reversible inactivation of the lateral line periphery using CoCl2 or(More)
The activities of single afferent fibers were recorded in the trunk lateral line nerve of the cichlid fishSarotherodon niloticus L. Using both electrophysiological recordings and neuroanatomical tracing techniques, the number, arrangement, and innervation of superficial (SNs) and canal (CNs) neuromasts were determined. Both, SNs and CNs, are innervated by(More)
The physiological aspects of the lateral line of Xiphister atropurpureus--a teleost with multiple, highly branched lateral-line canals on each body side--were investigated. In terms of sensitivity and frequency response, the lateral line of Xiphister is similar to simple, unbranched lateral-line canals. For both the dorsal and the medial trunk canal the(More)
The study focussed on the representation of the electrosensory and lateral line units in the midbrain of the axolotl Ambystoma mexicanum. In addition, the responses to photic and acoustic/vibrational stimuli were determined. Unit properties were characterized with respect to baseline activity, sensitivity, latency, directional specificity and number of(More)
Topography, morphology, and innervation of superficial neuromasts and canal neuromast in adult bony fishes ofSarotherodon niloticus (L.) were studied and compared by light and electron microscopical methods. Apart from certain other morphological differences the two neuromast types also differ in innervation. They can be distinguished by the number, course,(More)