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occipital lobes
| Question | Answer |
|---|---|
| Where is the location of the occipital lobes? | Beneath the occipital bone and is distinguished from the parietal lobe by the parietal-occipital sulcus |
| What are the landmarks in the occipital lobes? | The calcerrine sulcus (devides upper and lower halves), vertral surface (lingual gyrus,fusiform gyrus) |
| How many different visual areas are there? | 9 |
| Where are colour functions distributes? | across most of occipital cortex but v4 especially - indicates that colour vision is required for other visual functions, depth, motion, object recognition |
| What does the V1: primary visual cortex ( striate cortex) do? | receives input from the LATERAL GENICULATE NUCLEUS of the thalamus. Projects to all other occipital regions. First level of hieracrhy |
| what does the v2 do? | secondary level of hierarchy. also projects to all other occipaital regions |
| What are the 3 parallel pathways the develop? | 1Parietal pathway - dorsal stream. 2 inferior temporal pathway -ventral stream. middle pathway |
| What does the parietal pathway do? | Visual guidance of movement (where) |
| What does the inferior temporal pathway do? | object perception and colour |
| What does the middle pathway do? | perhaps visuospatial functions |
| What happens when v4 is damaged. | colour area. only see in grey - fail to perceive and recall colours |
| What happens when v5 is damaged? | unable to see things in motion |
| what happens if v3 is damaged? | affect percpetion |
| What is apperceptive agnosia? | unable to distinguish visual shapes - trouble recognisinf,copying or discriminating between different visual stimuli |
| What is simultagnisia? | ability to percieve shape of object but can't percieve more than one shape at a time |
| What causes apperceptive agnosia? | bilateral damage to the lateral parts of the occipital lobes. including areas sending output to ventral stream. lower level of processing |
| What is associative agnosia? | inability to recongise objects despite apparent percpetion of object |
| What causes associative agnosia? | damage in the ventral stream by anterior temporal lobes |
| What is prosopgnasia? | inability to recongise faces? |
| What causes prosopagnosia? | bilateral damage in theregion below the calcarine fissure at the temporal junction |
| What is alexia? | the inability to read |
| What is the cause of alexia? | probably damage to leftt fusiform and lingual gyru |
| WHat is visuospatial agnosia? | disorders spatial perception and orientation |
| What is topographic disorientation? | inability to find ones way in familiar environments |
| What is the cause of viseospatial agnosia? | damage to the right medial occipito-temporal region inculding the fusiform and lingual gyris |
Created by:
Jem S
Popular Psychology sets