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Understanding Behavior in HD.final.8-18-05 - Huntington's Disease ...

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Often, it is helpful for caregivers to try to understand why the person with <strong>HD</strong> is act<strong>in</strong>g <strong>in</strong> a particular<br />

way. If caregivers can determ<strong>in</strong>e what might be caus<strong>in</strong>g or trigger<strong>in</strong>g the unwanted behavior, it becomes easier<br />

to cope with the behavior and, sometimes, to prevent the difficult behavior from recurr<strong>in</strong>g. Listed below are<br />

some possible reasons for behavioral difficulties <strong>in</strong> <strong>HD</strong>. A specific behavior may be the result of one or all of<br />

these reasons.<br />

HOW DOES THE BRAIN CONTRIBUTE TO<br />

BEHAVIOR CHANGES IN <strong>HD</strong>?<br />

UNDERSTANDING ANATOMY AND RELATED BEHAVIORS<br />

Different parts of the bra<strong>in</strong> are responsible for different aspects of our behavior. Below is a picture of a<br />

bra<strong>in</strong> show<strong>in</strong>g some of these different general responsibilities.<br />

For <strong>in</strong>stance, the occipital lobes conta<strong>in</strong><br />

the cells which help us to see. These cells tell<br />

us the shape, color and movement of th<strong>in</strong>gs<br />

we see. The neighbor<strong>in</strong>g parietal lobes tell us<br />

the spatial location of th<strong>in</strong>gs that we see,<br />

hear or touch, just like a map tells us the<br />

location of countries, cities and roads. The<br />

temporal lobes are very important for our<br />

memory, conta<strong>in</strong><strong>in</strong>g cells that help us<br />

remember a face, a name or an event that has taken place. The frontal lobes make up the largest area of the<br />

bra<strong>in</strong> and conta<strong>in</strong> the highest levels of our behaviors. The frontal lobe area of the bra<strong>in</strong> is often considered the<br />

“boss,” or chief executive officer (CEO), of the rest of the bra<strong>in</strong>. The follow<strong>in</strong>g list <strong>in</strong>cludes executive functions<br />

of the frontal lobes.<br />

• Organiz<strong>in</strong>g<br />

• Establish<strong>in</strong>g the priority of various events<br />

• Controll<strong>in</strong>g impulses<br />

• Monitor<strong>in</strong>g self-awareness<br />

• Beg<strong>in</strong>n<strong>in</strong>g and end<strong>in</strong>g activities<br />

• Creative th<strong>in</strong>k<strong>in</strong>g<br />

• Problem-solv<strong>in</strong>g<br />

Although the effects of the <strong>HD</strong> gene are not fully understood, the primary site of known pathology is the<br />

caudate nucleus <strong>in</strong> the bra<strong>in</strong>, where the greatest number of bra<strong>in</strong> cells die because of <strong>HD</strong>. We cannot see the<br />

caudate from our picture of the bra<strong>in</strong> above because it is located deep with<strong>in</strong> the bra<strong>in</strong>. Let’s take a closer look

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