1. | |
2. | Grading criteria: There are four structures described in the chapter:
1. Thalamus—receives sensory input from the PNS
2. Basal ganglia—is important for learning skills (movement)
3. Hippocampus—is critical for learning new information and remembering autobiographical information
4. Amygdala—adds emotional content to memories |
3. | Grading criteria: There are two examples described in the chapter:
1. Octopus—finds its way through a maze, learns to open a jar for a food reward, learns to grab the correct ball by watching another octopus (social learning)
2. Nematodes—learn to approach or avoid tastes/odors |
4. | |
5. | Grading criteria: The main problem is that phrenology assumes that the shape of the skull reflects the shape of the brain, which is not true. Other acceptable answers: Gall studied only the skulls, not the actual brains, of living people; it was misused by quacks trying to make money; it was used to justify mistreatment of criminals and others deemed inferior to the ruling class. |
6. | Grading criteria: Structural neuroimaging allows one to see the anatomical areas but not their activity; functional neuroimaging allows one to look at the activity of brain areas. |
7. | Grading criteria: There are numerous possible examples, including eyeblink, knee-jerk, newborns’ sucking, diving reflex, palmar grasp reflex, among others. Answer must not be a learned response (e.g., salivating when driving past one’s favorite restaurant, which is learned, not reflexive). |
8. | Grading criteria: Some of the key components are as follows: watch for cars; visual input passes from eyes, through thalamus, to visual cortex; frontal cortex helps determine movements such as stepping down off the curb, how quickly to move legs; this information is sent to M1; M1 sends messages down to the brainstem, which connects to the spinal cord, and so the messages travel down spinal cord to muscles; one walks across the street. |
9. | Grading criteria: Include basic details: presynaptic cell, release of neurotransmitter (and that it is a chemical), postsynaptic receptors bind to neurotransmitter, postsynaptic cell integrates the message and decides to fire if the signal is strong enough. (Ideally, explain that this is all-or-nothing.) |
10. | Grading criteria: Explain that human brain lesions are usually due to accident/illness and vary from person to person, and can involve many brain areas; in animals, can disable specific single brain regions. Note that a general explanation of why animal research is justified would not be sufficient to answer this question. |
11. | Grading criteria: The engram is the supposed physical change in the brain that forms the basis of a memory. Lashley tried to find the engram by lesioning different areas of rats’ brains and examining the effect on them of learning to run a maze. He was not successful—no one area appeared to be crucial for remembering the maze. His results revealed that memories are not completely localized in the brain. |
12. | Grading criteria: Single-cell recording involves implanting a microelectrode into a single neuron and transmitting the signal to speakers that “hear” the response; a stimuli is presented or the animal subject performs a task as changes in the response of the neuron are measured. Researchers would use this technique in order to find out what individual neurons’ roles are in a behavior, which is more precise than determining entire brain areas involved. |
13. | Grading criteria:
1. Electrical stimulation of individual neurons—use electrodes to deliver electrical stimulation, causing a response in the neuron
2. Transcranial magnetic stimulation—stimulate entire brain areas in humans with a strong magnetic pulse |
14. | Grading criteria: Attention can improve memory in general; however, no good evidence exists at this time that any attention-boosting drugs improve memory in normal healthy people. |
15. | Grading criteria: Include the main steps: Stimulate cell A, record from cell B; stimulate A with a burst of high-frequency stimulation; later, stimulate A again with weak stimulation, see that B responds more strongly than it did before. |