1) Hemineglect? 2) Assumption of effect?

[Mattalbie]

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Hi

Need some help, thanks in advance.

1. a) Re: hemineglect patients. When drawing a circular clock face, I understand why the patient only draws half the clock face, numbers from 12 to 6 (7 to 11 are ommitted) however howcome they can still draw a whole circle which represents the external boundary of the clock face? Check this link to scholapedia for an example http://www.scholarpedia.org/article/Hemineglect

b) Re: hemineglect patients. Can the patient feel pain or touch in the neglected side?

2) Completely different area. What does "assumption of effect" mean?

Thanks

 

[myelin]

Hi

Need some help, thanks in advance.

1. a) Re: hemineglect patients. When drawing a circular clock face, I understand why the patient only draws half the clock face, numbers from 12 to 6 (7 to 11 are ommitted) however howcome they can still draw a whole circle which represents the external boundary of the clock face? Check this link to scholapedia for an example http://www.scholarpedia.org/article/Hemineglect

b) Re: hemineglect patients. Can the patient feel pain or touch in the neglected side?

2) Completely different area. What does "assumption of effect" mean?

Thanks

1a. My thoughts are that the individual still has a mental representation of what a circle is and can draw it when asked. It would be interesting after they patient drew the circle to ask them to trace the circle with their finger before they placed the numbers. This way you could also check for anosognosia (unawareness of a brain injury) which is common in right-sided lesions. I've also seen clock drawing tests that already have the circle drawn for the patient and all they must do is draw in the numbers and set the clock to a certain time.

b. I'm not completely sure, but I think that nociception is mediated by the spinal cord. Also, I think it would matter how deep the injury went and if it affected the limbic system. What I do know is about hemiparesis (weakening of one side of the body) and hemiplegia (paralysis of one side of the body) that is common with this kind of injury. That is, if the person has a right hemisphere lesion that contacts the precentral gyrus (motor strip), they will likely develop left hemispatial neglect as well as hemiparesis/hemiplegia on the left side of the body.

 

[Neuro-Dr]

myelin is right. Once the object is recognized (as a clock) there will be the ability to call up all neural networks with propositional and analogical information about clocks. However, when then using visual cues to guide the drawing, they will neglect. This can happen with other common objects like houses or complex shapes, though if it is one that is abstract, they may neglect the whole side.

 

[myelin]

a few other neglect tests. . .

- Have the patient write the alphabet. They may write on only one side of the page

- line bisection tasks

- letter/symbol cancellation tasks


Consider reading a bit about the difference between motor and attentional neglects.

Line bisection is quick and easy. I'm using it for a project at the moment. Normal, right handed individuals tend to bisect a line further left due to the RH attentional bias (pseudoneglect).

Here is a real-world example of how pseudoneglect can affect responses on a likert scale:

http://neweconomist.blogs.com/new_economist/2007/01/likert_scale.html

 

[biogirl215]

From a comment on myelin's link:

Or that the scale not be linear but ... scrambled. That is, an electronic poll is conducted by means of a computer and the selections arrayed on a pop-up screen in a 2D manner but moved about from question to question.

Hmmm... Now THAT would be interesting to study.