Corpus Callosum/ Coordination MC

[bomb]

Ok, so for the MC with the corpus callosum being cut, I put that he would have trouble dressing himself, I'm going to say dressing yourself is a two hand task.

So, if two hands are to coordinate to get your clothes on, messages need to travel between the cerbral hemispheres telling each hand to work together.

And, say if I want to put my watch on with my right hand on to my left, messages need to travel to tell me whether it is too tight, loose, etc.

[rudaid]

someone looked it up on wikipedia on a different thread and it said coordination is fine but memory isn't

but i did the getting dressed thing as well!

[Visionz]

Dressing was the correct answer... we think. The reason why it was correct doesnt matter because unit 3 is dead.

[Hongld]

It's fact that Right side of the body is controlled by the left hemisphere and vice versa. No crossing of neural impulse is involved.

[bomb]

It's fact that Right side of the body is controlled by the left hemisphere and vice versa. No crossing of neural impulse is involved.

What about if you need to coordinate sensory from the left with motor from the right?

[Visionz]

It's fact that Right side of the body is controlled by the left hemisphere and vice versa. No crossing of neural impulse is involved.

But how does a person choose which hand ties the loop on their shoes when theres no information being shared between the two hemispheres?

[minilunchbox]

I don't think anyone uses the Nelson book. But if you do, page 44 there's a bit on 'Alien hand syndrome' which says, 'in one case, a woman with a severed corpus callosum had a lot of trouble dressing herself each morning. She was physically capable of this simple task, but while one hand would fasten buttons, the other hand would undo them again. She would reach for an item from her wardrobe with one hand while the other would take it and put it back again.'

I mean, clearly this is a very long shot but I vaguely remembered something similar to this which is why I put down trouble dressing herself.

[Visionz]

I don't think anyone uses the Nelson book. But if you do, page 44 there's a bit on 'Alien hand syndrome' which says, 'in one case, a woman with a severed corpus callosum had a lot of trouble dressing herself each morning. She was physically capable of this simple task, but while one hand would fasten buttons, the other hand would undo them again. She would reach for an item from her wardrobe with one hand while the other would take it and put it back again.'

I mean, clearly this is a very long shot but I vaguely remembered something similar to this which is why I put down trouble dressing herself.

Thats sort of frightening. reminds me of this http://www.urbandictionary.com/define.php?term=the%20stranger

[minilunchbox]

I don't think anyone uses the Nelson book. But if you do, page 44 there's a bit on 'Alien hand syndrome' which says, 'in one case, a woman with a severed corpus callosum had a lot of trouble dressing herself each morning. She was physically capable of this simple task, but while one hand would fasten buttons, the other hand would undo them again. She would reach for an item from her wardrobe with one hand while the other would take it and put it back again.'

I mean, clearly this is a very long shot but I vaguely remembered something similar to this which is why I put down trouble dressing herself.

Thats sort of frightening. reminds me of this http://www.urbandictionary.com/define.php?term=the%20stranger

I already knew what that meant (woo Scrubs), yet I still click to read it. Sigh.

[Visionz]

some chicks DO kinky. Its normal.

[Hongld]

It's fact that Right side of the body is controlled by the left hemisphere and vice versa. No crossing of neural impulse is involved.

But how does a person choose which hand ties the loop on their shoes when theres no information being shared between the two hemispheres?

I just think about the experiment/test where pictures are flashed to L/R visual field, and the split brain patient is still able to point to the object identified using their hands.

[Visionz]

It's fact that Right side of the body is controlled by the left hemisphere and vice versa. No crossing of neural impulse is involved.

But how does a person choose which hand ties the loop on their shoes when theres no information being shared between the two hemispheres?

I just think about the experiment/test where pictures are flashed to L/R visual field, and the split brain patient is still able to point to the object identified using their hands.

They cant point to it with their left hand if its sent to their left hemisphere.

I dont even know what we're arguing here.

[Hongld]

Arguing? I think it's just discussing Because it is confusing.

They can use their left hand. My notes from teacher says so. And 2009 exam says they can point to it if sent to left/right hemisphere..
I need answers, there's many confusing questions in the MC, esp that REM NREM sleep :S

[minilunchbox]

Arguing? I think it's just discussing Because it is confusing.

They can use their left hand. My notes from teacher says so. And 2009 exam says they can point to it if sent to left/right hemisphere..
I need answers, there's many confusing questions in the MC, esp that REM NREM sleep :S

REM NREM sleep was pretty straight forward. I mean through elimination, it was really only D except VCAA stuffed up. The biggest thing is if they give the mark to everyone or pull a 'choose the most correct answer' excuse.

Unless, of course, you're speaking about a different question.

Why would severing the corpus callosum affect memory though?

[Hongld]

http://en.wikipedia.org/wiki/Split-brain#Memory

Memory
In most tests, memory in either hemisphere of split-brained patients is generally lower than normal, though better than in patients with amnesia, suggesting that the forebrain commissures are important for the formation of some kinds of memory. It is suggested that posterior callosal sections which include the hippocampal commissures cause a mild memory deficit (in standardized free field testing) involving recognition[9].

Control
In general, split-brained patients behave in a coordinated, purposeful and consistent manner, despite the independent, parallel, usually different and occasionally conflicting processing of the same information from the environment by the two disconnected hemispheres. When two hemispheres receive competing stimuli at the same time, the response mode tends to determine which hemisphere controls behavior[10]. Often, split-brained patients are indistinguishable from normal adults. This is due to the compensatory phenomena; split-brained patients progressively acquire a variety of strategies to get around their interhemispheric transfer deficits.

Wiki isn't always reliable though. So I don't know. I didn't know how it affects memory either. But I eliminated everything else.