the liver and the brain

Wolf Kirchmeir wwolfkir at sympatico.ca
Wed Sep 1 07:19:41 EST 2004


James Michael Howard wrote:

> On Tue, 31 Aug 2004 19:44:26 -0400, Wolf Kirchmeir
> <wwolfkir at sympatico.ca> wrote:
> 
> 
>>ray scanlon wrote:
>>
>>
>>>David Longley writes:
>>>
>>>
>>>
>>>>Don't you think sleight-of-hand and metaphysics deserves derision?
>>>
>>>
>>>Well, then let's drop all the sleight-of-hand and metaphysical
>>>prejudices and talk about the brain.
>>>
>>>Since the neural net (interneurons) appeared in Cnidaria, what has
>>>changed? For one thing, the DNA has evolved to a point where it is
>>>able to construct a whole series of motor program generators, groups
>>>of neurons that when triggered produce a motor act. These generators
>>>can be modified by experience but they are not learned. We are born
>>>with them.
>>>
>>>The location in the nervous system of some of these motor program
>>>generators can be more or less specified.
>>
>>[...]
>>
>>Are you claiming that we are born able to walk?
>>
>>The development of the motor cortex is actually a good deal more 
>>complicated than you appear to believe. Even in animals that can walk a 
>>few minutes after birth. So I would prefer to say that we are born ready 
>>to learn certain things. If that learning is impeded, we may never learn 
>>to do the things we are "born with."
> 
> 
> Walking awaits myelinization of the pertinent nerves; this causes the
> delay.



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