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Psych 304 Lecture Notes - March 17th

Psych 304 Lecture Notes - March 17th - Psych 304 Lecture...

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Psych 304 Lecture Notes March 17 th , 2009 Case of S. - using photographic memory - no one has had a memory as good as S. (as far as we know) - S. is already deceased Textbook Fig 18.2 synaptic changes that could provide basis for storage of memory - taxi drivers have large hippocampus because they need to remember all the street names & locations - a) after training, there are 3 options: o 1. increase in neurotransmitters (pre-synaptic changes) o 2. changes in post-synaptic receptors (therefore not only changes in neurotransmitter number can occur) o 3. changes in both pre- & post-synaptic neurons - b) excitatory interneuron will increase number of neurotransmitters being transmitted - c) formation of new synapses: o neuron on the left can also recede if not active for a while (not shown in figure) - d) rearrangement of synaptic input: o shift in synaptic input (recession of left neuron, formation of new connection between middle & right neuron) - the more you reinforce something you have learned, the stronger the neural connections & the better you will remember it Non-Associative Learning: (vs. Classical Conditioning which is associative) Habituation : becoming insensitive to stimuli that have no special significance or consequence for current behavior Sensitization : general increase in an animal’s responsiveness to a noxious stimulus (can occur even after only one exposure to the stimulus) - Aplysia californica : (Handout) o same cells are involved in habituation & sensitization (as well as classical conditioning) o Textbook Fig 18.6 o Animal retracts if subjected to mechanical stimulus (gets habituated if you continue mechanical stimulus) o Interneuron (on handout) can be inhibitory or excitatory o 24 sensory neurons (that react to sensory stimulus) & 6 neurons that retract o when siphon is touched for the first time, Aplysia will retract o when behavioral habituation occurs, changes occur in motor neuron (not sensory neuron, therefore, animal still “feels” the stimulus)
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