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Evolution

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2010 at 10:12
Originally posted by Omar Omar wrote:

How can an IQ test that isn't even valid amongst humans possibly be valid with animals? That's a weak correlation with a bogus variable. Its better evidence for the opposite point.


The validity of the IQ test is debatable. Can you think of a better measure of intelligence than an IQ test? It may not be perfect, but I have yet to see something better.

As for the correlation, between .3 and .4 is weak/medium. It is statistically significant, and therefor supports the hypothesis of a positive correlation between brain size and intellect.

Originally posted by Omar Omar wrote:

Which part would that be?


In humans versus other hominids, the cerebral cortex is one example as it is crucial to the development of cooperative social relationships.

http://en.wikipedia.org/wiki/Cerebral_cortex#Association_areas

Originally posted by Omar Omar wrote:


That's irrelevant. If brain size determined proficiency in a field then I should be more dextrious than my cat. The basic controls are the same. If the cat's body size make a difference then your admitting that the size of the brain can be tailored to its host without sacrificing functionality.


Not true. Your cat has a certain number or neurons and sensory receptors. The number will depend on its body size and how much sensory information it must process to do what it efficiently needs to do to survive as an animal. Your cat needs a brain large enough to take in the information transmitted by neurons, compute a response to deliver to motor functions, and then the speed to transmit those orders quickly.

With your larger body and greater physical mass (plus far far greater number of neurons therein), your brain needs to accommodate an increased number of sensory signals transmitted by neurons, as well as being able to process that information quickly and then transmit a response to your motor functions. Your cat naturally is able to respond far quicker than you, as it processes a fraction of the sensory signals and must transmit orders to a fraction of the muscles that you must.

But then again, all of this relates more to motor function and speedy transmission of sensory information rather than actual intelligence.

Quote That we can agree on, because developed doesn't mean large.


It doesn't necessarily mean large, but it often does. Sometimes the brain manages to include a larger number of neurons in the brain without the brain increasing in size overall. But typically the brain must increase in size to accommodate this increase in brain neurons.

Quote Once upon a time our best theory about the creation of the world was the book of genesis. Just because its 'our best guess' or 'current' doesn't mean its correct.


I will consider this theory to be the most persuasive and convincing until someone presents me with something better. If you have a better theory, I would love to hear it Smile



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