Brain And Behaviour 2 TB7 - All Lectures

TB7 L1 – Clinical Neurology
Stroke - Usually unconscious during stroke
- Cannot move or speak initially (Deficits)
- Get better overtime but with certain deficits
- But only rarely have very specific impairments

The primate - Early visual cortex  Dorsal or ventral
visual system
- Dorsal goes into the parietal lobe (Where pathway)
- Responsible for motor movement and location
- Parietal lobe feeds to the frontal lobe forming the Attentional control
network
- Attentional control network  Decision making
- Sensory input  Parietal Cortex  Frontal Cortex
- Therefore, damage in the frontal/ parietal lobe  Damage cognition
- Parietal cortex – Different parts respond to different stimuli

Main functions of Space based attention
Parietal cortex - The world around us
- Spatial recognition
- Represent physical self in the world

Object based attention
- Attention to a specific stimulus
- Directing attention

Reaching and grasping
- Attend to different objects
- The need to interact with objects

Magnitude processing
- How many objects
- Identify the amount of items

Feature based attention
- Attend to parts of an object specifically
- Specific object based attention


Hemispatial Lesions develop when blood is cut off to the region (Cannot regrow)
Neglect Characteristics
- Space based attention
- Damage to right parietal lobe
- Left side of space is not attended to
- But able to attend to it if directed to
- Patients are unaware of their issue (Suggesting attentional problem)
- E.g. Not able to draw a complete daisy (Missing one side) even in
mental image
- Patients are not “conscious” about objects in LVF but they see it
- They see it but not really (processed)