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Physio Psych Chapter 4 Continued


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What are the three main parts that make up the forebrain?
1. Cerebral cortex.

2. Corpus callosum.

3. Anterior commissure.
What part are most people referring to when they talk about "the brain"?
The forebrain
What is the cerebral cortex?
Basically the blanket over the brain where all the cool stuff happens.
How many layers compose the cerebral cortex?
6 laminae, they are separated by fibers.
About how large is the cerebral cortex when it's unfolded?
About the size of a folded out newspaper.
Are the 6 layers of the cerebral cortex related?
Yes, they all do different jobs to achieve the same function.
What is the corpus callosum?
A bundle of axons dedicated to cross-hemisphere communication. Located in the center of the skull.
For what purpose would a corpus callosum be severed?
Severe epilepsy.
What are the four lobes of the brain?
1. Frontal lobe

2. Parietal lobe

3. Occipital lobe

4. Temporal lobe
Where is the frontal lobe located?
Everything forward of the central sulcus.
What is the central sulcus?
The big fold in the middle of the brain. This separates the frontal lobe from the rest of the brain.
What two parts make up the frontal lobe?
1. Prefrontal cortex

2. Prefrontal gyrus
Where is the prefrontal cortex, and how large is it?
It is located in the very forward section. Large-brained species usually have big ones, and the bigger the brain, the bigger the prefrontal cortex.
What is the function of the prefrontal cortex?
Receives info from all the senses and is tied to working memory.
What is the other name for the prefrontal gyrus?
Primary motor cortex.
Where is the prefrontal gyrus located?
Right next to the sulcus.
What is the function of the prefrontal gyrus?
Contralateral organization and voluntary movement. Signals to move are generated here.
What portion of the brain defines the parietal lobe?
From the central sulcus to the visual cortex.
What major structure is found in the parietal lobe?
The postcentral gyrus.
What is the function of the postcentral gyrus?
It organizes all incoming touch sensations.
What is the other name for the postcentral gyrus?
The primary somatosensory cortex.
What is the function of the parietal lobe?
It monitors all info on body, head, and eye positions.
What does the Homunculus picture mean? What does it translate to?
It is a drawing laid out like your body to show how much of your cortex is dedicated to each body part. The space of the cortex correlates with density of receptors in the skin.
Is the postcentral gyrus (sensory cortex) contralateral or ipsilateral?
Contralateral - the left hemisphere has the right side of the body on it.
Which lobe is sometimes called the sensory association area?
The parietal lobe.
What is the back half of hte parietal lobe called?
The visual association area.
What three parts make up the visual cortex?
1. The visual association area.

2. The whole occipital lobe.

3. Part of the temporal lobe.
Where is the occipital lobe located?
Runs to the bottom of the cortex.
What is the other name for the primary visual cortex, and why?
The striate cortex, because of the banded gray and white colors.
What is a retinotopic map?
The cortex is basically a viewing screen of what the retina sees. The same places are activated when you see something as when you think of something.
What are hypercolumns?
Where is the temporal lobe located?
Laterally, near the temples.
Where is the auditory cortex located?
Temporal lobe.
What is specialized in the left hemisphere of the temporal lobe?
Soken language and visual aspects of movement and face recognition.
Which lobe regulates some emotion and motivation?
Temporal lobe.
What is Kluver-Bucy syndrome?
Previously wild and aggressive monkeys show loss of fear and anxiety with damage to the temporal lobe.
What is the binding problem?
Since brain regions are specialized, how do the regions know when they are working on the same stimulus? Is it simultaneous activity in separate regions? If so, how do we account for different processing speeds?

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