Sentences with phrase «number of neurons at»

«Composed of roughly 100 billion neurons... the human brain is so complex that scientists have not yet found a way to record the activity of more than a small number of neurons at once, an in most cases that is done invasively with physical probes.»

But the number of neurons at a time with which microelectrode arrays can interface must be increased several-fold while making sure the scale - up does not cause damage to brain tissue.

Not exact matches

What all these have in common is that, without any central control, individual units (genes, cells neurons or workers) respond to simple, local information, in ways that allow the whole system (cells, brains, organisms or colonies) to function: the appropriate number of units performs each activity at the appropriate time.

Among the questions that this study raises are whether the surprisingly large number of neurons in bird brains comes at a correspondingly large energetic cost, and whether the small neurons in bird brains are a response to selection for small body size due to flight, or possibly the ancestral way of adding neurons to the brain — from which mammals, not birds, may have diverged.

Instead mice injected with stem cells developed a far greater number of synapses, or connections between neurons, at the damaged site than control mice did.

At first Modha and his team hit a wall before they reached 40 percent of the number of neurons present in the mouse cerebral cortex: roughly 8 million neurons, with 6,300 synaptic connections apiece.

They counted the numbers of APs and ALs in different body tissues — intestine, muscle, pharynx (i.e., the animal's foregut), and neurons — at different time points during the adult life of C. elegans, and used chemical blockers to learn more about the dynamics of the process.

The team found that people have large numbers of neural stem cells and progenitors early in life — an average of 1618 young neurons per square millimeter of brain tissue at birth.

The results indicate that the highest number of new hippocampal neurons was observed in rats that ran long distances and that also had a genetic predisposition to benefit from aerobic exercise: Compared to sedentary animals, HRT rats that ran voluntarily on a running wheel had 2 - 3 times more new hippocampal neurons at the end of the experiment.

Neuroscientists Jing Wang and Freda Miller, both then at Toronto's Hospital for Sick Children, showed that when nondiabetic mice are given metformin, their memory improves, thanks to an increase in the neural stem cell population and in the number of these cells that develop into healthy neurons in the hippocampus, the brain's memory center.

The number of mature neurons (NeuN +) was at their highest in the 3 - NP - iPSC - 7 rats, which were similar to the sham mice, with 3 - NP and NP - iPSC - 42 rats having significantly fewer mature neurons than the sham rats.

The researchers are now working on scaling up the number of electrodes so they can record from multiple neurons at a time, potentially allowing them to determine how different parts of the brain are connected.

Significant increases in neuron numbers were not observed in lamina 4, 5, 6 adjacent to injury centers, despite rescue of neurons more distal to the zone of injury; an outcome most likely due to neuron loss resulting from direct trauma to these laminae at time of injury.

«If you look at the number of neurons in the brain and you multiply that by the number of connections between those neurons... it really starts to outpace the number of stars in the universe,» Leuthardt said.

At any given moment only a few neurons at any location are actually firing at any appreciable firing rate, and so you're representing the world at any given time with a relatively small number of active componentAt any given moment only a few neurons at any location are actually firing at any appreciable firing rate, and so you're representing the world at any given time with a relatively small number of active componentat any location are actually firing at any appreciable firing rate, and so you're representing the world at any given time with a relatively small number of active componentat any appreciable firing rate, and so you're representing the world at any given time with a relatively small number of active componentat any given time with a relatively small number of active components.

Despite the elegance, simplicity and beauty of this principal, it is still unclear how the number of parasympathetic neurons is controlled and why only some of the cells transported by nerves are transformed into that which becomes an important part of the nervous system», says Igor Adameyko at the Department of Physiology and Pharmacology who, together with Patrik Ernfors at the Department of Medical Biochemistry and Biophysics, is responsible for the study.

The numbers of neurons in our brains begin to decrease at the age of thirty and some neurological diseases can result from significant loss.

Scientists at the University of Texas discovered that to some extent the loss of brain volume is balanced by larger numbers of connections between neurons.