15 Answers and Explanationsfor Neurons-Learning-Vision W09

15 Answers and Explanationsfor Neurons-Learning-Vision W09...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Last Set of Krasne Study Questions I know that some of these were very hard. Hopefully that made you think more carefully about the material than you might otherwise have done!! 1. If a neuron that starts with equal amounts of sodium (+) and chloride (-) ions outside and the same amounts of potassium (+) and A - ions inside, what will happen if the cell becomes permeable to chloride?. a. nothing b. it will become negative inside c. it will become positive inside Answer is b. Since there is a high concentration of Cl- outside, it will enter and make the inside negative. Chloride will keep drifting in until the inside is sufficiently negative to repel further entry of these negative ions. 2. Suppose one pinched a retinal ganglion cell so hard that it fired madly and then died. The most likely sensation of the individual would probably be one of a. light or shadow b. touch and pain c. both a and b. 4. Learning of the finger-tapping task used in the experiments showing a need for sleep-produced consolidation and re- consolidation was probably due to a. synaptic changes in the hippocampus b. synaptic changes in the basal ganglia and cortex Answer is b. Motor skills, of which this task is an example, are learned by the procedural system, which is the one that does NOT involve the hippocampus. 5. Suppose one made a mouse whose gene for making CREB2 were “knocked out” (i.e. made non-functional) a. this mouse probably would not be able to learn b. this mouse would probably learn normally but not be able to remember for more than a few hours c. this mouse would probably learn easily and remember well with less training than a normal mouse Answer is c. If CREB2 (“bad” CREB) were gone, there would only be “good” CREB. As with the fruit flies such a mouse might be expected to have a photographic memory. Very little experience would lead to good long-term learning. 6. Suppose a cell had more CREB1 than CREB2, and following each learning experience CREB1 remained “tagged” less long than CREB2. Then, according to the logic of the fellow who did the experiments on fruit flies, for a given number of training trials, a. massed training would probably produce more long-term memory than spaced training b. spaced training would probably produce more long-term memory than massed training c. spaced and massed training might not be much different in the amount of long-term memory they produced. I think the best answer is c. Under these circumstances, after each training trial there would be more CREB1 tagged than CREB2, but with the passage of time this situation would reverse. Thus learning would be stabilized starting right after each trial and would persist until the amount of tagged CREB1 fell below the amount of tagged CREB2. It seems to me that the amount of time during which tagged CREB1 would be higher than tagged CREB2 would be about the same for massed and spaced trials. I suppose that if trials were EXTREMELY massed they might come so close together that, 3. . Suppose that the top left figure (marked “figure”) shows the pattern
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/29/2011 for the course PSYCH Psych15A taught by Professor A during the Winter '09 term at UCLA.

Page1 / 4

15 Answers and Explanationsfor Neurons-Learning-Vision W09...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online