Selective Attention and Awareness : Prioritising objects of Awareness

What does damage to V1 cause?

What does damage to V1 cause?

Cortical blindness as the retina input is intact. Lack of conscious awareness of visual scene. unconscious processing remains

What is blindsight and when does it occur?

Above-chance visual performance in the ‘blind hemifield’.

Occurs due to unilateral damage to the primary visual cortex.

What are pateints with blindsight capable of?

• pupil reflex

• manual and saccadic localisation

• wavelenght and motion discrimination

• orientation and shape

What is perimetry?

it is a way to test for blindsight. the optic disk is where there are no photoreceptors and hence is a blind spot so should always be 50 % chance.

what is manual pointing to test for blindsight?

pointing to a stimulus in visual feild. shows some information is gettin into the higher order processing even with the lesion in the primary visual cortex.

How can blindsight be possible?

What does change blindness show?

Attention regulates concious visual awareness.

How ‘aware’ are we really/

dont need consiousness as shown by blindsight. attention limits our awarenedd in real world scenarios.

Why are we only aware of a small amount of the world?

how can attention be defined?

What is covert attention?

Attention without moving the eyes.

What is the posner queing task?

what did the posner queing task reveal?

spatial awareness alters neural processing speed.

What are neurons in the parietal cortex modualted by?

By attention. As shown by higher AP in neurons in attended areas, and larger and faster responses in those neurons in monkeys.

What did the experiments of attention in v2 and v4 of monkeys reveal?

Biggest effect of aattention when 2 objects in the RF. As two type and trying to prioritise what is important.

What did Watanabe et als experiment with focusing on expansion or translation of dots reveal?

if either was viewd passivley it didnt change fMRI effect. But focusin gon either movements did change signals. Showing attention affected fMRI signals and hence affects early and mid level visual processing in humans.

What is the evidence for the unconsious perception of spacial neglect?

cant say if houses are different. As in cant differentiate if the other house has fire on the side. But when asked which they prefer they will say the house without the fire.

What is the evidence that the pareital lobe is associated with attention?

the unilateral spatial neglect effect.