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You may want to read Meaidi et al (2014). They obtained dream reports from congenitally blind, late blind, and matched sighted controls. To quote the abstract, they found: All blind participants had fewer visual dream impressions compared to sighted control participants. In late blind participants, duration of blindness was negatively correlated with ...


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The time required to learn Braille may vary depending on factors such as age, partial/full and early/late blindness and individual differences (see here), but what has come out of studies such as this is that visual deprivation appears to speed up Braille learning. In the study I cite, all subjects received the same degree of training, but individuals who ...


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Depending on the instructions that you give to the person, you might be able to disguise the fact that they are completing a color-blindness test. You could use stimuli like those in the Ishihara test, but instead ask the subject to do a math problem where they add the previous two numbers. You can also tell them that sometimes no number will be presented, ...


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I basically agree with @Nick Stauner, but I want to add another important aspect, namely the gradient of photoreceptor densities in the human retina: In the fovea there is a sharp peak in cone density compared to more eccentric regions, as described in Curcio et al. (1990) and see the graph in Web Vision. But admittedly, rod receptor densities surrounding ...


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Bipolar cells reduce transmitter release when hyperpolarized, see the wikipedia page. When the bipolar cell is fully hyperpolarized it will basically stop releasing neurotransmitters. If transmitter release ever becomes totally zero I do not dare to say, however.



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