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Darwin on the inheritance of learned characteristics

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Jan31-14, 05:06 AM
P: 103
That should be Lamark! That should be epigenetics! Right? (I remember reading something about breeding rats with a fear of cherry blossom scent)

I thought that Darwin rejected all this, but maybe I am confused with how his work was later interpreted by other people in light of Mendel..?

My textbook says Darwin said in "The Expression of the Emotions in Man and Animals" that you could inherit learned emotional responses, is that true?

I mean, is it true that he said that?

My textbook Psicología de la Emoción, UNED:
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Jan31-14, 06:42 AM
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Pythagorean's Avatar
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I don't know the history of Darwin, but you remind me of this recent article:

A study shows that when mice are taught to fear an odor, both their offspring and the next generation are born fearing it. The gene for an olfactory receptor activated by the odor is specifically demethylated in the germ line and the olfactory circuits for detecting the odor are enhanced.
Lamarck revisited: epigenetic inheritance of ancestral odor fear conditioning
Jan31-14, 07:41 AM
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Enigman's Avatar
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It's Darwin all right.
And the experiment that did away with Lamarck was:

Jan31-14, 07:57 AM
P: 103
Darwin on the inheritance of learned characteristics

Quote Quote by Enigman View Post
It's Darwin all right.
And the experiment that did away with Lamarck was:

The first of the three is the "principle of serviceable habits," which he defined as useful habits reinforced previously, and then inherited by offspring. He used as an example contracting of eyebrows (furrowing the brow), which he noted is serviceable to prevent too much light from entering the eyes.

That's the opposite of what I associate with Darwin. I would have associated him with the idea that we evolved to have light hurt our eyes, and to avoid pain, but not that furrowing our brow out of noticing that furrowing the brow worked to block out light would somehow cause a mutation that would make our children do it instinctively.
I thought of all Darwinian evolution as being the result of mutation, never the concious choice of, say the giraffe, to stretch his neck every day to try and reach food, until his DNA codes for a longer neck... i didn't think the mutations were supposed to be caused by our behaviour, I thought they were supposed to be random.
Again, I mean, according to Darwinian evolution.

I wonder if those mice inherited a fear of having their tails cut off. I think I remember a study saying you can teach mice to be afraid of tastes and smells but not noises and flashing lights, and you can teach birds to be afraid of noises and flashing lights but not tastes and smells. Just because the ancestors of the mice had to worry a lot more about getting poisoned and the birds had to worry a lot more about predators.. I am probably remembering the details wrong. I know I read about it in a psychology book called "Motivation" by Phil Evans.

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