Binocular rivalry and perception of ambiguous objects II

Question 1

When does binocular rivalry occur?

(1 mark)

Answer 1

• Happens when one image presented to persons left eye and other to their right and these will then alternate in conscious perception

Question 2

Whats the ‘bottom-up’ control of binocular rivalry?

(2 marks)

Answer 2

• Strong stimulus in left eye causes strong inhibtion in the right eye
• 2 populations of neurons represent both eyes - so if make connection to inhibitory interneuron and that makes a connection to the right eye ^^happens above

Question 3

What is the top down view of binocluar rivlary?

(2 marks)

Answer 3

• Control is from higher cortical areas
• Parietal cortex on the right hemisphere is involved

Question 4

How is caloric vestibular stimulation used to affect us?

(2 marks)

Answer 4

• Disrupts the brainstem
• Cld water in ear affecting the ‘balance’ organ affects the opposite hemisphere
• Right hemisphere affects the brainstem action on the left
• (in context of binocular rivalry - one stimuli would change in domiannce after caloric stimulation)

Question 5

What did right caloric stimulation do?

Answer 5

Affected the left hemisphere and changed predominance in the left eye stimulus

Question 6

What is the link between the rate of switching and neurosphysciatric disorders?

Answer 6

People with BD seen to have slwo rivalry and one stimlulus remains in dominance for longer. BD patients seen to have a smaller mPFC which is implicated in rivalry

Question 7

What was teh difference in rivalry seen in manic and non-manic phases in BD patients?

(1 mark)

Answer 7

Manic phases tended to show faster rivalry and more switches compared to their depressive phase

Question 8

What was seen within certain brain regions when the vase-face illusion was presented?

(1 mark)

Answer 8

• Found higher activity in the FFA when transition was from vase to face

Question 9

What does an EEG show?

Answer 9

Brain activity - able to rell if reversal of images have occured through EEG by subject pressing a button and EEG will correlate if brain activity also shows a reversal in images

Question 10

Where are face stimluli cells located?

Answer 10

In the temporal lobe

Question 11

What is flash suppression?

Answer 11

• Image is presented to one yeye and then suppressed by a flash of another image presented to the other eye