Sentences with phrase «small number of neurons»

Even though the original source of the seizure is usually only a small number of neurons on one side of the cerebral cortex, the discharge of these neurons causes other neurons to discharge also, eventually causing the seizure to be generalized.

Instead, a very small number of neurons specifically activated by learning show an expansion of structure that's both surprisingly extensive — there's a dramatic increase in the size and complexity of the affected neurons — and yet highly restricted to a small subset of cells.

«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 why were so many neuromodulators involved in regulating such a relatively small number of neurons?

This provides an advantage from a neural prosthetics perspective, Andersen says, as a small implant sampling a small number of neurons can provide information for many types of intended movements.

For instance, when a person sees a clock, only a small number of neurons become active, enough to do pattern matching that draws upon the brain's memory of a clock and compares it with the object's basic features — its round shape, the presence of numbers — to draw a conclusion that this thing is a clock.

These abilities are controlled by a relatively small number of neurons (about 10,000) that can be grouped into about 300 morphologically distinct neuron classes.

Memory functions in the brain work according to a principle that neuroscientists call «sparse coding», i.e. a comparatively small number of neurons encode complex information — possibly to make overlap between different memories more unlikely.

Their results, outlined in a paper published today by the Journal of Neuroscience, suggest that the activity of a remarkably small number of neurons — as few as 25 — is required to be able to distinguish between different odors.

«It is remarkable that such a complex behavior could be generated from such a small number of neurons» says Dr. Sousa - Neves.

How could such a small number of neurons produce such a dramatic increase in memory?

«If function is localized, with small numbers of neurons bunched together doing similar things, that's consistent with sparse coding, high selectivity, and low population spiking rates.

In their search for sleep - regulating cells, Wu's team used genetic engineering to turn on small numbers of neurons in more than 500 fruit fly strains.

Not exact matches

Mishra's team focused on a neurotransmitter called brain natriuretic peptide (BNP), which is expressed in a small number of sensory nerve cells or neurons.

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.

That is one of the surprising results of the first study to systematically measure the number of neurons in the brains of more than two dozen species of birds ranging in size from the tiny zebra finch to the six - foot - tall emu, which found that they consistently have more neurons packed into their small brains than are stuffed into mammalian or even primate brains of the same mass.

Instead of a small number of large, powerful processors working continuously, the brain contains billions of relatively slow, small processors — its neurons — which consume power only when activated.

This decision appears to be generated by a very small number of excitatory neurons that use acetylcholine as their neurotransmitter located in three brain regions.

Its three hundred neurons have been classified into about one hundred types, which is not that much smaller than the number of neurons.

The photoreceptor neurons in each ommatidium, or small unit of the compound eye, are always eight in number.

«TDP - 43 is also deposited in the neurons of people who have dementia,» he says, «and, in a small number of ALS cases, dementia precedes loss of motor function.»

The total numbers of small neurons were measured by counting small round cells after positive staining by Tuj1or L1 - after fixation, and the count excluded a few Purkinje cells or astrocytes.

Furthermore, this line expressed Gal4 in a small region of the wing pouch and a number of neurons during the younger developmental stages.

Even though it may sound like a small difference the 14 billion neurons amount to pretty much the number of neurons that a baboon brain has or almost half the number of neurons in the gorilla brain.

Jun. 13, 2016 — The first study to systematically measure the number of neurons in the brains of birds has found that they have significantly more neurons packed into their small brains than are stuffed into mammalian and even primate brains of the same mass.

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 components.

In a series of electrophysiological studies, Zoghbi's team further found that neurons from animals with depleted MECP2 levels have reduced electrical activity due to a smaller number of excitatory synapses, whereas cells from animals carrying an extra copy of the gene have increased electrical activity because of an increase in synapse number.