Question

Question 7: Describe the anatomy of the dorsal stream and the ventral stream of vision and their functions. Explain the symptoms a person demonstrates when they have selective damage to each stream. Keywords: occipital, parietal and temporal lobes, object recognition, visual agnosia, Balint’s syndrome, conscious and unconscious.

Answer 1

Dorsal stream of vision is otherwise known as where pathway. is recognizing where objects are in space. This pathway originates from the primary visual cortex in the occipital lobe forward into the parietal lobe.

The ventral stream (what stream)runs down from the visual cortex into the temporal lobe. and involved with visual identification and recognition. Both these streams are interconnected. It has connections with the limbic system and dorsal stream.

Dorsal stream injury

• Akinetopsia: Inability to perceive motion through space
• Simultanagnosia: Here the patient can only describe single objects.  
• Apraxia: Inability to produce volitional movement in the absence of muscular disorders.
• Balint's syndrome.

Ventral stream injury.

• Results in a person's ability to recognize objects.
• Visual agnosia.