Talk:Cephalization

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Comment

"Cephalization is advantageous in that organisms with greater cephalization can analyze a new and potentially hazardous environment without moving their entire bodies into it."

This explains why it is advantageous to have a head (i.e., an extension with sensory organs located on it), but not a brain in the head. In fact, the explanation here provided has nothing to do whatsoever with why cephalization is evolutionarily advantageous. The best explanation concerns the costs of sensory-motor neuronal fibers that extend to the anterior and posterior regions. See "Component Placement Optimization in the Brain" (1994) for more.

For now, I suggest you high school kids stop writing whatever it is you feel like writing. Cite your sources. And stop writing whatever it is you feel like writing.

This article needs to be re-written. Most evolutionary theorists now agree that evolution does not have directionality (e.g. Stephen Jay Gould, Time's Arrow, Time's Cycle, or Richard Dawkins, Climbing Mount Improbable). The article, though on a potentially useful topic, is written from a non-expert's viewpoint that is potentially misleading. Mccajor 18:20, 13 April 2007 (UTC)[reply]

http://www.britannica.com/EBchecked/topic/103013/cephalization references that this is 'considered an evolutionary advance' however there will probably be edits to this removing that line without any other sources referencing it. So, if we cannot provide a source, I would say flag the page for deletion or re-tag to improve citation.Lewiscb (talk) 03:59, 28 March 2010 (UTC)[reply]

Inconsistency with Hydra and Nerve net articles

This article states: "Even hydras, which are primitive, radially symmetrical cnidarians, show some degree of cephalization. They have a 'head' where their mouth, photoreceptive cells, and a concentration of neural cells are located." The nerve net article states: "A nerve net consists of interconnected neurons lacking a brain or any form of cephalization." The hydra article states: "The nervous system of Hydra is a nerve net, which is structurally simple compared to mammalian nervous systems."

These statements are in conflict with one another. If the hydra's nervous system is a nerve net, and nerve nets lack any form of cephalization, then the hydra cannot show some degree of cephalization. If a nerve net lacks any form of cephalization, and the hydra shows some degree of cephalization, then the hydra's nervous system is not a nerve net. If the hydra's nervous system is a nerve net, and the hydra shows some degree of cephalization, then a nerve net can show some form of cephalization.

Someone who knows about this subject should make a correction. 167.131.0.194 (talk) 23:17, 6 June 2016 (UTC)[reply]

A Commons file used on this page has been nominated for deletion

The following Wikimedia Commons file used on this page has been nominated for deletion:

Carcharodon carcharias drawing.jpg

Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 23:06, 3 March 2019 (UTC)[reply]