Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Brain's which Part motivates

  1. Mar 14, 2005 #1
    I just wanted to know that Brain 's which part motivates the Human and how does it do it........
  2. jcsd
  3. Mar 15, 2005 #2
    i know u all know but who will motivate u to answer me ...i guess...
  4. Mar 15, 2005 #3


    User Avatar
    Science Advisor
    Homework Helper

    Well, I don't know about motivation in general but I do know a little about neurotransmitters and drug addiction:

    We have a nice balance between neurotransmitters released in the pre-synaptic neurons with the corresponding receptors in the post-synaptic neuron. The relative "abundance" of neurotransmitters and receptor molecules can change, for example by the presence of drugs which mimic neurotransmitters. Chronic exposure to these drugs in the synapse can cause either the availability of neurotransmitter to decline or receptor molecules to decline since the drug "hyper-activates" the synapse. The neurons "adapts" to this by reducing the number of receptors or neurotransmitter molecules available to the synapse.

    Now imagine removing the drug. The synapse now has a deficiency of chemical transmitters.

    Because of this, the "efficiency" of nerve signal relay within the synapse is degraded causing "fatigue" of one sort or another. This "motivates" the drug abuser to seek more drugs in an effort to re-establish prior synaptic flow and is a significant factor in the "withdrawal" symptoms they experience when getting off of drugs.

    Perhaps other forms of "motivation" can likewise be described in terms of synaptic neurophysiology.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Brain's which Part motivates
  1. The brain (Replies: 2)

  2. Human Brain parts (Replies: 7)

  3. Brain parts (Replies: 6)

  4. Brain Parts (Replies: 4)