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Unformatted text preview: 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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This note was uploaded on 05/09/2009 for the course PSYC 304 taught by Professor Comeau during the Spring '08 term at The University of British Columbia.
- Spring '08
- Biological Psychology