Understanding Behavior in HD.final.8-18-05 - Huntington's Disease ...
Understanding Behavior in HD.final.8-18-05 - Huntington's Disease ...
Understanding Behavior in HD.final.8-18-05 - Huntington's Disease ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
32<br />
diagnosis or keep the diagnosis from the affected <strong>in</strong>dividual because they are concerned that he/she “cannot<br />
handle it.” Some people <strong>in</strong>terpret the unawareness as a sign that the <strong>in</strong>dividual “does not want to know” or<br />
will “get depressed” if he/she receives the diagnosis of <strong>HD</strong>. There is no evidence to suggest, however, that<br />
talk<strong>in</strong>g about <strong>HD</strong> to a person with unawareness will cause negative consequences.<br />
POSSIBLE CAUSES<br />
• Damage to circuits connect<strong>in</strong>g the caudate nucleus and the frontal and parietal lobes.<br />
• Normal psychological response to an overwhelm<strong>in</strong>g situation.<br />
• The circuit that relays <strong>in</strong>formation from other centers <strong>in</strong> the bra<strong>in</strong> to the frontal lobes (where appropriate<br />
actions are considered and <strong>in</strong>itiated) is <strong>in</strong>terrupted by caudate degeneration secondary to <strong>HD</strong>.<br />
In the f<strong>in</strong>al case, although the person with <strong>HD</strong> may still be able to see and hear accurately, the <strong>in</strong>formation<br />
seen and heard is often not available to the boss or decisionmaker of the bra<strong>in</strong>. Consider the example below.<br />
The eyes see that the person has two different shoes on and the visual <strong>in</strong>formation gets sent to the occipital<br />
cortex, which has cells to read shape, color, and movement. This <strong>in</strong>formation then travels toward the frontal<br />
lobes, where the boss will <strong>in</strong>struct the “motor controller” to change shoes. When an <strong>in</strong>dividual has <strong>HD</strong>,<br />
however, the cells <strong>in</strong> the caudate are break<strong>in</strong>g down and the <strong>in</strong>formation never gets relayed back to the frontal<br />
lobes.<br />
EXAMPLES<br />
Miles cont<strong>in</strong>ues to say that he will live with his wife and she will care for him, even though she has filed<br />
for divorce.<br />
Bob bathes and shaves only when asked, due to his difficulty recogniz<strong>in</strong>g how he smells or when his<br />
hygiene is poor.<br />
Claire will not go to the doctor. She says, “Noth<strong>in</strong>g is wrong with me, I’m not sick.”<br />
Steve will not say he has <strong>HD</strong>.<br />
When asked, Beverly says she has no change <strong>in</strong> her speech or walk<strong>in</strong>g and no uncontrollable movements,<br />
although she has severe chorea and slurred speech.