It's an interesting set of questions to explore. Having thought about this for many years now (since Blake Ross' post on Aphantasia) my hypothesis is that there wouldn't be any decoding because there is no attention on a visual based internal mind object. As a comparative, if we could decode audio from a person's mind and then you took someone who didn't do echoic recall, then you would expect to "hear" static. The percentage of the population who doesn't do echoic recall is, in some references, estimated to be about 60%.
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It's an interesting set of questions to explore. Having thought about this for many years now (since Blake Ross' post on Aphantasia) my hypothesis is that there wouldn't be any decoding because there is no attention on a visual based internal mind object. As a comparative, if we could decode audio from a person's mind and then you took someone who didn't do echoic recall, then you would expect to "hear" static. The percentage of the population who doesn't do echoic recall is, in some references, estimated to be about 60%.