Ed Boyden A light switch for neurons

We can use less or more of them.

There are 100 billion neurons in the adult human brain.

Now, what is the significance of these mirror neurons?

Mirror neurons and imitation, emulation.

And we did that for tens of thousands of neurons, built digital models of all the different types of neurons we came across.

Well, the brain, as you know, is made up of neurons.

Reduction in the activity of the cholinergic neurons is a well known feature of Alzheimer's disease.

It paralyzes you. It starts by killing the motor neurons in your spinal cord.

And you may have more or less neurons.

In this species, the nervous system is sexually dimorphic the nervous systems of the two sexes, males and female hermaphrodites, have different numbers of neurons and groups of neurons that perform sex specific functions.

And there is whole chains of neurons around this room, talking to each other.

But let's think about this. How can you make a small number of neurons do a lot?

Brain imaging studies have now shown that the human brain contains a similar mirror neuron system (MNS).

As both human and monkey mirror neurons code hand manipulation and facial gestures, some interesting hypotheses have emerged.

Broca's region is the human counterpart of the monkey mirror neuron area.

But remember that this kind of brain, which is much, much smaller instead of 100 billion neurons, it has 100,000 neurons but this is the most common form of brain on the planet and has been for 400 million years.

They say, If we could record the activity of our neurons, we would understand the brain.

Chronic stress inhibits neurogenesis and also causes many hippocampal neurons to shrink a process called remodeling.

Neurons operate as a cooperative group more arrive at the location than are needed for a simple replacement.

These channels are closed when the membrane potential is near to, or at, the resting potential of the cell.

This told us that the new neurons were not born by division of existing neurons, but were born elsewhere in the brain and went through a migratory stage during which they were not recognized as neurons.

So, most of them will fire when I'm touched in different locations. Different neurons for different locations.

So, the fabric of the brain, even though your brain may be smaller, bigger, it may have different types of neurons, different morphologies of neurons, we actually do share the same fabric.

The pulses work by switching on motor neuron cells that are genetically modified to carry membrane channels that respond to ultrasonic waves.

It's also more than cataloging because you actually have to build three dimensional digital models of them.

And I claim that what happened was the sudden emergence of a sophisticated mirror neuron system, which allowed you to emulate and imitate other people's actions.

In the adult songbird brain, we can find at any moment many little migrating neurons ready to replace cells that have died.

This told us that the new neurons were not born by division of existing neurons, but were born elsewhere in the brain and went through a migratory stage during which they were not recognized as neurons.

Brain imaging, combined with the new conceptual framework implied by research on the mirror neuron system, promises to uncover a more holistic social brain.

The patients who have a migraine preceded by an aura have a band of excited neurons that's shown in red that moves at three to five millimeters a minute towards the mid brain.

But if we waited longer for example, 1 3 weeks, depending on part of brain we found quite a few tagged neurons.

It took at least a week for the first new neurons to reach their destination and acquire the looks of an adult neuron.

Brain imaging, combined with the new conceptual framework implied by research on the mirror neuron system, promises to uncover a more holistic social brain.

They are named for their resemblance to neuronal dendrites, as both have many spine like projections, but dendritic cells are in no way connected to the nervous system.

Chronic stress inhibits neurogenesis and also causes many hippocampal neurons to shrink a process called remodeling. Animal studies have shown that the stress hormone cortisol, together with neurotransmitters in the brain, also plays an important role in the remodeling of neurons.

This remodeling includes limited replacement of neurons in the hippocampus, a brain region important for spatial memory and memory of events in our daily lives.

Animal studies have shown that the stress hormone cortisol, together with neurotransmitters in the brain, also plays an important role in the remodeling of neurons.

This is a tool that lets us pass a magnetic pulse through somebody's skull, into a small region of their brain, and temporarily disorganize the function of the neurons in that region.

The content there's color, there's ideas, there's memories, there's history. And somehow all that content of consciousness is accomplished by the busy activity of those hoards of neurons.

This clock is found in a wide range of fly cells, but the clock bearing cells that control activity are several dozen neurons in the fly's central brain.

And the difference between shaking in this way and not The difference between shaking in this way and not is related to the misbehavior of 25,000 neurons in her subthalamic nucleus.

It was so successful in evolution that from mouse to man it expanded about a thousandfold in terms of the numbers of neurons, to produce this almost frightening organ, structure.

For humans, the MNS may provide a more sophisticated copying mechanism that helps us to understand the intentions of other people in a sense, to read their minds.

There's another simulation of the cerebellum that's more than half the neurons in the brain again, works very similarly to human skill formation.