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4

If there is a stimulus at E, there will be depolarization (membrane becomes relatively more positive). It is just that no action potentials are fired. Therefore, if a strong stimulus does arrive, it will depolarize the membrane to an extent depending on its strength. It will increase the height of the succeeding B phase or reduce the dip of the succeeding E ...


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Strictly stated, Hebb's rule applies only to existing synapses, and not to the formation of new synapses. (This answer applies to biological neurons, not to ANNs). Synapse formation is a topic of active research. During development (and in fact continuously even during adulthood), many synapses are created and destroyed. It is not unreasonable to suspect ...


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As I recall from textbooks I read as an undergrad, one mechanism of drug tolerance works by increasing the necessary thresh-hold at a synapse such that larger concentrations of neurotransmitter or more-frequent action potentials in the upstream axon were required to depolarize the membrane and propagate the signal. Yes - usually through a reduced ...


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Keegan's answer is good I gave it an up vote. I want to offer a valid alternative. Psychology may induce redundant pathways which trigger approximate simultaneous firing of neurons near or in completely different parts of the brain. Emotionally intense memories can trigger emotions, basically hallucinations of the event, smells and touch based ...


11

It's caused by a sudden shift in the pressure needed to circulate blood to your brain which your body fails to respond to sufficiently quickly. This results in a sudden loss of blood pressure termed Orthostatic Hypotension which, in term, results in a transitory reduction in the blood supply necessary for brain function. You experience a momentary loss of ...


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Misophonia Misophonia is a relatively unexplored chronic condition in which a person experiences autonomic arousal (analogous to an involuntary “fight-or-flight” response) to certain innocuous or repetitive sounds such as chewing, pen clicking, and lip smacking. Misophonics report anxiety, panic, and rage when exposed to trigger sounds, ...


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Yes, bones can be innervated. I say "can be" because although I'm not certain that ALL are, I know that most are. "Innervation" is your key word to learning more about the presence or absence of nerves reaching to any body part. Googling "are bones innervated" yields plentiful results, but the short answer is yes. If you were to chop your leg off with ...


3

It may be because, when we move our shoulders towards our the body, also know as abduction (Fig 1.) gives the central part of the body an elevation. when we rotate our arms more upwards (Adduction), the elevation will be lost. So in other words, when we are making snow angels, Start Normal position (hands near thighs) = Back and shoulders on ground ...


4

Normal people see color due to the bellow mentioned combination of red, green and blue: But due to genetic factors, The graph Distorts: Now,If consider the normal Color code for yellow: Yellow = R(255) + G(255) + B(0) Or in other words Max. Red + Max. Green + no Blue = Yellow That means even if you can see a little of Red and Green, you can still a ...


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It's very likely that memory is "lossy" and holographic, such that you can keep adding more information indefinitely, but retain it with less and less accuracy. Memory isn't a digital storage system with X gigabytes of capacity, and the inputs to memory aren't neat little packets. What we remember are a web of associations and patterns. Vastly ...


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There are an estimated 100 billion neurons within the human brain. In general a minor variation in the number of neurons should not effect individuals too much, however when there is a more significant loss, such as brain injury or in some forms of dementia cognitive abilities do decline. So in this sense yes the number of neurons does relate to ...


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Three possible mechanisms are mentioned in the first referenced article [1]: Attentional blink - the failure to detect a (visual) stimulus [2]. Visual short-term memory - non-permanent storage of visual information over an extended period of time [3]. Psychological refractory period - the period of time during which the response to a second stimulus is ...


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A mechanical stimulus can act on a tissue with elastic and viscoelastic properties in two ways [1, 2]: distort the cellular membrane which leads to opening of ion channels. create tension on the extracellular matrix or cytoskeleton, to which a ion channel is bound, thus leading to opening of the channel. Stretch-activated ion channels opening leads to ...


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I think that the advantages of using both hands with equal ease is quite evident whether it be sports, at your work or while you are doing your household chores. An obvious advantage is using both hands to write or draw with both at the same time. I would be focusing on the disadvantages that may be faced. 1) Ambidextrous people are more prone to ...



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