Naked Science Forum
Life Sciences => Physiology & Medicine => Topic started by: scientizscht on 24/03/2019 23:47:07
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What stimuli triggers different regions of the brain?
Is there a map or something? (I would say complete list if I didn't get bullied for it)
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Here is a diagram showing which areas of the brain relate to different sensory inputs. It is a rather distorted view of the human body, emphasising the hands, lips and tongue:
https://en.wikipedia.org/wiki/Cortical_homunculus
Some areas like the hippocampus and pre-frontal cortex integrates events spanning many senses.
In general, the right side of the brain deals with the left side of the body (and vice-versa).
However, there are some specialised areas on one side; for example, in most people, understanding language is primarily on the left side of the brain, in Broca's area.
https://en.wikipedia.org/wiki/Broca%27s_area
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Here is a diagram showing which areas of the brain relate to different sensory inputs. It is a rather distorted view of the human body, emphasising the hands, lips and tongue:
https://en.wikipedia.org/wiki/Cortical_homunculus
Some areas like the hippocampus and pre-frontal cortex integrates events spanning many senses.
In general, the right side of the brain deals with the left side of the body (and vice-versa).
However, there are some specialised areas on one side; for example, in most people, understanding language is primarily on the left side of the brain, in Broca's area.
https://en.wikipedia.org/wiki/Broca%27s_area
I know this diagram but it's not what I am after.
What stimuli triggers e.g. amygdala or hippocampus?
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What stimuli triggers e.g. amygdala?
Anything that evokes strong emotions. A close brush with a tiger or a bus will in future evoke an immediate flight/fight response (although "fight" may not be an appropriate response to a bus).
Most sensory inputs are processed through the amygdala, and it is continually on the lookout for danger from any sensory input. There are suggestions of specialisation between the two sides of the amygdala.
See: https://en.wikipedia.org/wiki/Amygdala
What stimuli triggers e.g. hippocampus?
Anything that we think is useful for long-term memory. This can be something which is repeated many times, or something which occurs once but has great significance.
This can include aspects of any sensory input.
A Nobel prize was awarded for discovery of cells in the hippocampus that govern navigation and sense of direction.
See: https://en.wikipedia.org/wiki/Hippocampus
What stimuli triggers different regions of the brain?
These two regions are not tied to particular senses, but to experiences integrating all senses.
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"What stimuli triggers different regions of the brain?"
This
https://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation
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"What stimuli triggers different regions of the brain?"
This: Transcranial_magnetic_stimulation
Many of the experiments I have seen described use TMS to suppress activity in various regions of the brain.
The changing magnetic field induces random signals in a region of the brain, suppressing normal orderly firing in that region of the brain.
This suppresses normal brain function.
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This suppresses normal brain function.
I've found watching soap operas has a similar effect.
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Do the high magnetic fields encountered in MRI machines have any temporary or long term effects on brain function ?
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The two major fields in an MRI machine are:
- A very strong, steady field. The frequency of this is too low to affect the operation of nerves
- A Radio-Frequency field. The frequency of this is too high to affect the operation of nerves
Of course, manufacturers are producing machines of steadily higher power, so this may affect bodies at some point - but emulating the levitating frog with a human might take a while...