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Lecture 6

BIOL 1F25 Lecture Notes - Lecture 6: Aplysia Gill And Siphon Withdrawal Reflex, Aplysia, Startle Response


Department
Biological Sciences
Course Code
BIOL 1F25
Professor
Gaynor E Spencer
Lecture
6

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BIOL 1F25
SEPT 30TH 2015
LEC 6
Continuation from LEC 5..
Motor neurons just cause contractions
3 types of neurons
oSensory neurons
oMotor neurons
oInterneurons
Knee jerk reflex: MONOsynaptic circuit ( 1 synapse )
Most spinal reflexes are POLYsynaptic (more than 1 synapse)
oReflex networks can also be modified by the brain
PLANTAR REFLEX: stroke foot- normal response is downward response
(curling in of toes)
oBabinski response: upward w/ fanning of toes. Seen in infants ( up to ` 2
yrs)
Infant reflex- hidden as we age (inhibited by cortex) but can be unmasked by
brain trauma, some diseases of nervous system ( or excessive alcohol ) !
SUMMARY:
1. Stereotyped electrical signals (AP)
2. Connections (CHEMICAL SYNAPSES)
3. Specific connection patterns
4. CONNECTIONS CAN BE MODIFIED BY EXPERIENCE (long or short term )
LEARNING AND MEMORY
“ “ is a major vehicle for behavioral adaptation
Studies of learning – important for both normal and abnormal behaviors
DEF’n :
oLEARNING – is the process of acquiring info
oMEMORY- storage and retrieval of info over time
2 classes of learning:
oAssociative (higher form of learning)
Animal/ person learns about relationship b/w 2 stimuli and / or a
stimulus and its behavior
Ex. Children
oNon – associative (simple forms of learning)
Animal / person learns about the properties of one stimulus
Non- associative
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