Sensory physiology: Brainless eyes

  title={Sensory physiology: Brainless eyes},
  author={R{\"u}diger Wehner},
The visual equipment of box jellyfish includes eight optically advanced eyes that operate with only a rudimentary nervous system. As they produce blurred images, their function remains an open question.Missing link?Cubozoans, or box jellyfish, each have twenty-four eyes of four types, but no central brain for information processing. An investigation of these eyes reveals optics as sophisticated as in vertebrates. Despite this, the retina is out of focus and the sharp image is not used to… 
Pattern- and contrast-dependent visual response in the box jellyfish Tripedalia cystophora
A behavioural assay is used to examine the obstacle avoidance behaviour of the Caribbean cubomedusa Tripedalia cystophora and it is proposed that the medusae use contrast as a semi-reliable measure of distance to the obstacle.
The influence of computational traits on the natural selection of the nervous system
The results presented in this paper show that computational robustness is an important parameter to understand the evolution of nervous system.
Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo
Deep Homology?: Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo is Lewis Held's final act in a threepart series discussing developmental evolution. Part one of the series−Quirks of
Universal Genome in the Origin of Metazoa: Thoughts About Evolution
An experimentally testable hypothesis of Universal Genome is proposed that has two major predictions, first that a significant fraction of genetic information in lower taxons must be functionally useless but becomes useful in higher taxons, and second that one should be able to turn on in lowerTaxons some of the complex latent developmental programs, e.g. a program of eye development or antibody synthesis in sea urchin.
The Evolution of Complex Organs
  • T. Gregory
  • Physics
    Evolution: Education and Outreach
  • 2008
The various direct and indirect evolutionary processes that contribute to the origins of complex organs are reviewed, the evolution of eyes is used as a case study to illustrate these concepts, and several of the most common misconceptions about complex organ evolution are discussed.
Structural models of “simple” sense organs by the example of the first Metazoa
  • M. Aronova
  • Medicine
    Journal of Evolutionary Biochemistry and Physiology
  • 2009
Basic variants of the evolutionary program of formation of simple sensory systems-structural models of gravitation receptor, organ of sight, chemoreceptor organ as well as of the nervous system at
Emmetropisation in the Camera-Type Eye of the Squid
This chapter discusses emmetropisation in vertebrates, specifically the role of vertebrates in human eye growth and the challenges faced by humans in this phase of eye growth.
Psychophysiology and Psychosomatics
The discipline of psychophysiology concerns the study of the link between psychological processes and somatic physiology, which is the interface between mind and body. The chapter discusses the basic
The influence of computational traits on the natural selection of the nervous system
The results presented in this paper show that computational robustness is an important parameter to understand the evolution of nervous system.


Advanced optics in a jellyfish eye
It is shown that box-jellyfish lenses contain a finely tuned refractive index gradient producing nearly aberration-free imaging, demonstrating that even simple animals have been able to evolve the sophisticated visual optics previously known only from a few advanced bilaterian phyla.
Visual Ecology and Functional Morphology of Cubozoa (Cnidaria)1
  • M. Coates
  • Environmental Science
    Integrative and comparative biology
  • 2003
This literature review collects, into one place, what is known about: the multiple eye types of box jellyfish, cubomedusan life history and ecology, and the sensory and neural systems of box Jellyfish.
From Neuron to Brain
Although the authors have achieved a masterful overview of neurophysiologic processes, they have not attempted a comprehensive treatment of the mammalian nervous system and this volume provides a strong basis for reading and digesting other texts which deal more directly with clinically relevant material.
Animal eyes.
  • M. Wiener
  • Art
    The American orthoptic journal
  • 1957
For Aldo Leopold, the green fire in the wolf’s eyes symbolized a new way of seeing the authors' place in the world, and with his new insight, he provided a new ethical perspective for the environmental movement.
Activity‐dependent receptive field changes in the surround of adult cat visual cortex lesions
Small RF changes can be induced by visual stimulation within one hour in normal cells as well as in cells at the border of cortical lesions, which appears to be related to lesion‐induced changes of excitability.
Neuronal control of swimming in jellyfish: a comparative story
The swim-control systems of hydrozoan and scyphozoan medusae show distinct differences despite similarity in the mechanics of swimming in the two groups, and an elaboration of Romanes' dichotomy is used to suggest that cubomedusae are more closely aligned with the scy PHs, and to highlight areas of future research that could be used to look for common features of medusan conduction systems.
The ocellar component of flight equilibrium control in dragonflies
  • G. Stange
  • Biology
    Journal of comparative physiology
  • 2004
It is suggested that the reverse Purkinje shift is a functional adaptation to optimize the detectability of the contrast between sky and ground both in dim light and in direct sunlight.
Central control of swimming in the cubomedusan jellyfishCarybdea rastonii
The swimming system of Carybdea is comparable to the “giant fiber nerve net (GFNN)” of other scyphomedusae, and increases in muscle cell depolarizations may be related to the facilitation in the size of extracellularly recorded muscle potentials.
Desert ant navigation: how miniature brains solve complex tasks
  • R. Wehner
  • Biology
    Journal of Comparative Physiology A
  • 2003
The general message is that Cataglyphis uses path integration as an egocentric guideline to acquire continually updated spatial information about places and routes, and relies on procedural knowledge, and largely context-dependent retrieval of such knowledge, rather than on all-embracing geocentred representations of space.
Rock Magnetism: Fundamentals and Frontiers
Most observers of the geophysical scene, those involved with plate tectonics and continental drift in particular, are aware of the seminal contributions of rock magnetism and its sister discipline,