How does the brain understand visual information from eyes?
2 Answers
Electrical signals are relayed from the retina to the brain via the optic nerve.
Explanation:
Neurons in the visual cortex fire action potentials when visual stimuli appear within their receptive field.
Visual information is received through the eyes but interpreted with the brain. The ability to recognise what we see lies in the occipital lobe, near the back of the brain. The information about the image via the eye is transmitted to the brain along the optic nerve. The visual cortex is the largest system in the human brain and is responsible for processing the visual image.
The areas of the occipital lobe surrounding the primary visual cortex are also primarily involved with vision and are collectively referred to as extrastriate cortex. They play important role in visual processing. Visual information flows through a cortical hierarchy. They respond selectively to bars and specific orientations and combinations of bars. These support edge and corner detection. Basic information about colour and motion is also processed here.
The projections to the primary visual cortex from the thalamus travel along atleast three distinct pathways - M cells (magnocellular), P cells (parvocellular), and K cells (koniocellular). These different sets of neurons are each somewhat specialised for specific categories of stimuli. Neurons in the primary visual cortex are arranged into columns of neurons that have similar functional properties. These columns are collected into assemblies called as modules. Each module consists of an array of neuronal columns necessary to analyse one small area of the visual field.
Due to binocular vision it has to compare the image from both eyes and then centralize it to produce the most viable image...
Explanation:
It then sends the image back so that the body can act on it from previous experience..
To practice this you can close one eye and see the difference..
