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You are only yourself for around two hours at a time

The timescale of structural remodeling that accompanies functional neuroplasticity is largely unknown. Although structural remodeling of human brain tissue is known to occur following long-term (weeks) acquisition of a new skill, little is known as to what happens structurally when the brain needs to adopt new sequences of procedural rules or memorize a cascade of events within minutes or hours. Using diffusion tensor imaging (DTI), an MRI-based framework, we examined subjects before and after a spatial learning and memory task. Microstructural changes (as reflected by DTI measures) of limbic system structures (hippocampus and parahippocampus) were significant after only 2 hr of training. This observation was also found in a supporting rat study. We conclude that cellular rearrangement of neural tissue can be detected by DTI, and that this modality may allow neuroplasticity to be localized over short timescales.

http://www.sciencedirect.com/science/article/pii/S089662731200178X

http://mindblog.dericbownds.net/2012/04/our-brain-structure-changes-after-two.html
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Jonathan Langdale's profile photoLija onontora's profile photoJeremy Buchanan's profile photoIlsa Bartlett's profile photo
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I think 2 hours as me is probably enough. Then I would require some kind of break.
 
What might also be interesting is how much you can really learn in any one go. Obviously depends on what you're focusing on.
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