Login

Welcome, Guest. Please login or register.

March 29, 2024, 06:00:27 am

Author Topic: Mid-year assistance thread  (Read 21467 times)  Share 

0 Members and 1 Guest are viewing this topic.

mypurpleundercracka

  • Guest
Re: Mid-year assistance thread
« Reply #15 on: June 06, 2009, 01:42:30 pm »
0
can someone explain to me the limitations/disadvantages of fMRI?


jess3254

  • Guest
Re: Mid-year assistance thread
« Reply #16 on: June 06, 2009, 01:50:56 pm »
0
oh thanks alot jessie !
umm yeah sorta just wanted some model examples that could be used in the exam if they asked
just so theyre clear examples and such so if you could ! :)
but that was great though
thanks =]

Hmm, well, basically all you need to do is use the explanations I've provided, but apply it to the picture they've included in the exam. So:

Linear Perspective:
"The two lines parallel lines of the ____ in this above picture appear to converge (meet) as they recede into the distance."

Texture gradient:
"The ____ in this picture is perceived as having more texture or being 'more detailed' close up, however as the distance increases from the viewer, the ___ becomes more uniform, finer and smooth (less detailed.)"

Relative size
"The ____ in this picture which produces a larger image on the retina are perceived as being closer, whereas the ____ which produces a smaller image on the retina is perceived as being further away"

Height in the visual field
"The _____ which is drawn closer to the horizon is perceived as being further away, whereas the ____ which is drawn further away from the horizon is perceived as being closer to the viewer"

Interposition
"The _____ which partially obscures the _____ is perceived as being closer to the viewer"

If it isn't a specific example, and it's just asking you describe the principle in general, insert "object/s" or whatever.

I hope that's what you were after :S
« Last Edit: June 06, 2009, 02:02:12 pm by jessie0 »

jess3254

  • Guest
Re: Mid-year assistance thread
« Reply #17 on: June 06, 2009, 02:02:24 pm »
0
can someone explain to me the limitations/disadvantages of fMRI?



Advantages
-Shows both brain anatomy and brain function
-Non-invasive technique: does not require an injection
-In contrast to PET, images can be taken in rapid succession (in PET, pictures can only be taken every 30 seconds), so subtle changes in brain functioning can be observed.
-Can be used on healthy and clinical participants

Disadvantages
-Very expensive and requires highly trained staff
-Not good for claustrophobics
-Cannot be used on individuals who have metal objects in their bodies, such as pacemakers and pins.

d0minicz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 997
  • Respect: +6
Re: Mid-year assistance thread
« Reply #18 on: June 06, 2009, 03:14:56 pm »
0
During a power failure, Rosie Shiraz enters her darkened wine cellar with only a candle forlight. She picks up two bottles of wine, and can discern that one bottle is red wine and the other white wine. This illustration of brightness constancy can be best explained by the fact that:
A: the colour of each wine is identical on the retina, regardless of the surrounding light intensity
B: the two bottles of wine are below the differential threshold.
C: the two bottles of wine have maintained their level of brightness relative to their surroundings
D: the two bottles of wine still reflect the same amount of light, despite the darkness of the wine cellular.

need reasoning
thanks =]
Doctor of Medicine (UoM)

clauudia

  • Guest
Re: Mid-year assistance thread
« Reply #19 on: June 06, 2009, 03:33:55 pm »
0
just for clarification, dose:

PET show functions/structure
fMRI - functions? some of my notes say functions only and some say structure aswell.
ESB - functions
CT, MRI, EEG - structure


and say with the worded questions, is it true that if you use abbreviated words like EEG, you wont get full marks unless you say the actual electroencephalogram ?

thankyouu

d0minicz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 997
  • Respect: +6
Re: Mid-year assistance thread
« Reply #20 on: June 06, 2009, 03:46:21 pm »
0
PET- function
fMRI- both
ESB- which specific parts of the brain initiate/inhibit specific responses
CT - structure
MRI - structure
EEG- electrical activity of the brain (brain wave patterns for sleep etc)
Doctor of Medicine (UoM)

Glockmeister

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1660
  • RIP Sweet Nothings.
  • Respect: +8
Re: Mid-year assistance thread
« Reply #21 on: June 06, 2009, 04:03:24 pm »
0
During a power failure, Rosie Shiraz enters her darkened wine cellar with only a candle forlight. She picks up two bottles of wine, and can discern that one bottle is red wine and the other white wine. This illustration of brightness constancy can be best explained by the fact that:
A: the colour of each wine is identical on the retina, regardless of the surrounding light intensity
B: the two bottles of wine are below the differential threshold.
C: the two bottles of wine have maintained their level of brightness relative to their surroundings
D: the two bottles of wine still reflect the same amount of light, despite the darkness of the wine cellular.

need reasoning
thanks =]

C
- remember the brightness constancy fails if the intensity of brightness in the background is different from its surroundings.

just for clarification, dose:

PET show functions/structure
fMRI - functions? some of my notes say functions only and some say structure aswell.
ESB - functions
CT, MRI, EEG - structure


and say with the worded questions, is it true that if you use abbreviated words like EEG, you wont get full marks unless you say the actual electroencephalogram ?

thankyouu

On a simplistic level

PET - Function only
fMRI - Function AND structure
CT, MRI - Structure

Now, EEG technically does not map structure. It measures the electrical activity around the scalp which is assumed to be electrical activity from the cortical areas

Make sure though, you know in detail how and why these machines work.

As for the abbreviations, umm... I wouldn't imagine so, but just to be safe, you can write the full name once and then put (abbreviation). For example

The Positron Emissions Tomography (PET) shows research which area of the brain is involved when engaging in a task. The PET produces colourful images of the brain with darker areas indicating area being utilised...
"this post is more confusing than actual chemistry.... =S" - Mao

[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

2007: Mathematical Methods 37; Psychology 38
2008: English 33; Specialist Maths 32 ; Chemistry 38; IT: Applications 42
2009: Bachelor of Behavioural Neuroscience, Monash University.

clauudia

  • Guest
Re: Mid-year assistance thread
« Reply #22 on: June 06, 2009, 08:50:39 pm »
0
thanks!
and with the GSR, is there anythin wrong with saying that in ASC the changes in conductivity of the skin is from our emotions being heightened or dulled? bc in one of my practice exams, i lost 1/2 a mark for not choosing one of them.

d0minicz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 997
  • Respect: +6
Re: Mid-year assistance thread
« Reply #23 on: June 06, 2009, 09:39:40 pm »
0
ummm say during the heightened ASC , you may sweat more
this would increase the electrical conductivity of the skin => higher GSR reading
due to higher arousal
Doctor of Medicine (UoM)

jessie_111

  • Victorian
  • Adventurer
  • *
  • Posts: 16
  • Respect: +1
Re: Mid-year assistance thread
« Reply #24 on: June 06, 2009, 10:03:08 pm »
0
What is the easiest way to explain retinal disparity?
Always get confused haha! 

d0minicz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 997
  • Respect: +6
Re: Mid-year assistance thread
« Reply #25 on: June 06, 2009, 10:10:25 pm »
0
Retinal disparity is the difference between the two retinal images; due to the eyes being 6-7cm apart, each recieving a slightly different image. The brain uses this to judge depth and distance. The more disparity, the closer the object.
Doctor of Medicine (UoM)

mypurpleundercracka

  • Guest
Re: Mid-year assistance thread
« Reply #26 on: June 07, 2009, 03:18:45 pm »
0
Can someone explain and justify their answers for the following two questions:

Carmela is looking straight ahead at a projector screen. A picture of a wombat is flashed to her right
visual field only. If Carmela’s corpus callosum was completely severed, what would be the best way
for her to demonstrate what she had seen?
A. to name it verbally
B. to draw it with her right hand
C. to draw it with her left hand
D. to name and draw it with either hand


Question 3
In right-handed individuals, which part of the brain shows the highest levels of activation when
trying to solve a jigsaw puzzle?
A. left temporal lobe
B. right parietal lobe
C. right temporal lobe
D. left parietal lobe

jess3254

  • Guest
Re: Mid-year assistance thread
« Reply #27 on: June 07, 2009, 04:26:51 pm »
0
Carmela is looking straight ahead at a projector screen. A picture of a wombat is flashed to her right
visual field only. If Carmela’s corpus callosum was completely severed, what would be the best way
for her to demonstrate what she had seen?
A. to name it verbally
B. to draw it with her right hand
C. to draw it with her left hand
D. to name and draw it with either hand


Both A and B are correct. The information went to her left hemisphere (because the information was flashed into her right visual field), and the left hemisphere is involved in language. She would be able to articulate that the object she was viewing was a wombat.

However, she would also technically be able to draw it with her right hand. But in an exam, I’d go for A.

Quote
Question 3
In right-handed individuals, which part of the brain shows the highest levels of activation when
trying to solve a jigsaw puzzle?
A. left temporal lobe
B. right parietal lobe
C. right temporal lobe
D. left parietal lobe


It’s B.
-The right hemisphere is involved in visual-spatial tasks
-The parietal lobe association cortex is responsible for spatial orientation.
-A jigsaw puzzle is a spatial task.

mypurpleundercracka

  • Guest
Re: Mid-year assistance thread
« Reply #28 on: June 07, 2009, 05:23:18 pm »
0
some good multiple choice q's on this site:

http://media.pearsoncmg.com/ph/hss/livepsych/start.htm

d0minicz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 997
  • Respect: +6
Re: Mid-year assistance thread
« Reply #29 on: June 07, 2009, 05:42:26 pm »
0
hey anyone got the solutions to TSSM 2007 psych exam plz post =]
thanks
Doctor of Medicine (UoM)