Learning and Memory Flashcards

1
Q

What organisms were use to study the principles of learning and memory?

(Hint: There are three)

A

Aplysia

Dogs

Or

Human patients

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2
Q

For Apylisa learning behaviors, what reflex is used as a model for learning behaviors?

A

Gill withdrawal reflex

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3
Q

What are the two stimuli that would cause the aplysia to have the withdrawal gill response?

A

(1) touch on the mantle or siphon

OR

(2) a strong or noxious (harmful) shock to the head or tail

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4
Q

What are examples of simple learning?

(Hint: There are three)

A

Habituation

Sensitization

Dishabituaution

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5
Q

What is habituation?

A

The cessation (brought to an end) of a response to a stimulus after repeated presentation of the stimulus

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6
Q

True or False: Habituation is among the simplest of all forms of learning.

After repeated touches to the siphon or mantle, Aplysia “learns” to no longer withdraws gill.

A

True

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7
Q

Cellular mechanism of habituation

After the repeated firing of A.P. in sensory neuron

____________ channels in the terminal (activates/deactivates)

Transmitter vesicles at the terminal are _____________

A

V.G. Ca2+

deactivates

depleted

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8
Q

What is sensitization?

A

An increase in the strength of any reflex, caused by one or more strong stimuli other than the stimulus that usually evoke the reflex.

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9
Q

What is dishabituation?

A

The full recovery of the original strength of a habituated response after the presentation of some strong, novel stimulus

Occurs after habituation

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10
Q

Cellular mechanisms of sensitization and dishabituation

___________ is released by the facilitating interneuron onto the terminal of siphon sensory neuron.

A _______ is activated

which activates ___________

increase _______ levels

activates ____

phosphorylates V.G. K+ channels and close them

The A.P. therefore stay longer and result in larger gill response.

A

Serotonin

G Protein

adenylyl cyclase

cAMP

PKA

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11
Q

What is the most studied type of complex learning?

A

Associative learning

Or

Conditioning

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12
Q

What model can be used for observation of conditioning?

A

Invertebrates

and

Vertebrates

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13
Q

Who was the first person to study conditioning with a dog?

Hint: Experiment: He conditioned a dog to salivate to the sound of a bell.

A

Ivan Pavlov, a Russian psychologist in the early 20th century.

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14
Q

True or False: Aplysia can learn to associate a non-noxious stimulus (a slight touch to the siphon) with a noxious stimulus (a stong poke or shock to the head)

A

True

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15
Q

Before conditioning the animal (will/will not) exhibit the gill withdrawal reflex (GWR) in response to the light touch to the siphon.

After conditioning, it (will/will not) exhibit GWR to a light touch.

A

Will not

Will

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16
Q

In the example of Aplysia, what is an unconditional stimulus?

A

Poke in the head

response does not require training

17
Q

In the example of Aplysia, what is a conditional stimulus?

A

A light touch to the siphon

response requires training

18
Q

True or False: Aplysia is repeatedly touched lightly (CS) on the siphon, later bonked on the head (US). (Bonked a minute later)

This is associative learning.

A

False

CS and US need to be paired for associative learning

US alone cause sensitization

19
Q

Associate learning is similar to _____________.

Hint: Think back to Synaptic Transmission, Lec. 10

A

Associate LTP

20
Q

Cellular mechanism of Associative learning

Light touch (CS) alone (does/doesn’t) cause conditioning

Cause a (few/large) A.P in siphon sensory nerve

causing a relatively (small/large) Ca2+ influx into terminal

which will cause a (small/large) amount of transmitter releases which (does/doesn’t) cause a response in the motor neuron

Also, Ca2+ slightly elevates ______lvels in the siphon sensory neuron terminal by activating ___________ which turns on _____________.

However, the effect on _______ is too small to cause significant phosphorylation of ____ channels

A

doesn’t

few

small

small

doesn’t

cAMP

calmodulin

adenylyl cyclase

cAMP

K+

21
Q

Noxious stimulation alone (does/does not) condition, but sensitize

Two things happen

__________ of the direct pathways cause gill withdrawal

___________ of facilitating interneuron’s _______ pathways cause sensitization

A

does not

Activation

Activation

G protein

22
Q

True or False: Mantle sensory neuron pathway is also sensitized

23
Q

Combining siphon light touch (CS) with noxious head stimulation (US) results in ____________________.

A

Associative learning

24
Q

Associate learning happens in aplysia due to

____________is activated by __________ from siphon touch and the activated more by the ________pathways from the head bonk.

_______ phosphorylate many ______ channels (thus close them) chasing a big increase in the strength of the GWR in response to the light touch of the siphon

______ also causes permanent changes through _________________________________.

A

Adenylyl cyclase

calmodulin

G protein

cAMP

V.G. K+

cAMP

cAMP-regulated gene transcription strengthening the synapses

25
Q

Associative learning in human

Conditioning has been linked to ___________________.

Again: Think back to the Synaptic Transmission Lecture

A

Long Term potentiation (LTP) in the hippocampus

26
Q

True or False: The hippocampus is involved in certain types of learning and memory

The first best-studied case of the effects was the vase of a patient called H.M.

27
Q

Where is the hippocampus located?

A

Temporal lobe

28
Q

After H.M. surgery, he had a very specific memory deficit

Good (short-/long-) term memory, over seconds or minutes

Good (short-/long-) term memory for events before the surgery

Lacked the ability to ______ new short term memory to long term memory

A

short-term

long-term

transfer

29
Q

True or False: The hippocampus is where memories are made and stores.

A

False

Instead, the hippocampus appears to be involved in memory consolidation (the action of making memories stronger)

30
Q

Associate learning invertebrates

__________________ is a form of cellular learning occuring in the hippocampus.

A

Long Term Potentiation (LTP)

31
Q

True or False: Mice are genetically engineered to have elements of the cellular mechanism of LTP

A

False:

Mice are genetically engineered to lack elements of the cellular mechanisms of LTP

show learning and memory deficits.

32
Q

Like in sensitization, dishabituation or associative learning in Aplysia, Synaptic transmission in the hippocampus is _________follwoing a strong stimulus.

However, the _____________ of LTP are different from those in Aplysia.

shown on the last slide

A

enhanced

cellular mechanisms

33
Q

What is the cellular mechanism of LTP for weak stimulus?

A

Look at the image

34
Q

What is the cellular mechanism of LTP when there is a stong receptive stimuli?

A

Look at the image