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(Image: © Richard M. Evans/University of Hawaii at Manoa)
In the early 1990s, researchers found that the immune system was active on a cellular level even in young rats in a study that suggested they had a “brain-like structure that resembled the neocortex”. It seems that neurons have a structure that works very much like an adult’s neocortex, which in turn supports learning and memory. Although the idea that the brain is not the only organ involved in learning remained controversial in the 20th century, with it being accepted by Carl Sagan and several others that the central nervous system of the individual is a more complex unit that contains a brain, the phenomenon of memory formation in the rat has since been corroborated by more modern research.
Using a technique that takes advantage of light and fluorescence in tissue, scientists from the Institute of Neuroscience in Vienna and the University of Hawaii at Manoa have found that neurons in the adult rat hippocampus – a part of the hippocampus that is involved in learning (see “New Brain Tracks Learning”) – are connected to an area of the neocortex. The findings were reported on 19 February in the journal Nature Neuroscience1.
The new research suggests that neurons in the aged hippocampus are involved in the formation of hippocampal memories, which are also related to memory formation and maintenance through learning and storage in the adult brain.
To confirm this, the scientists used a technique called optogenetics, which uses cells that grow when injected with molecules. A neuron is called fluorescent if it is fluoresces – a phenomenon in which bright light turns a molecule within its nucleus temporarily bright red. Because the new research uses optogenetics, it was possible to use the mice in the study – which can be used to study neural mechanisms in mammals2 – to show what is required to cause specific neurons to fluoresce.
First, the scientists used fluorescent proteins to stain neurons that were in two different parts of the cortex: the dendritic and axonal branches (which are part of the nerve cell bodies and nerve cell membranes, respectively). The
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