Not sure of your background, but I was under the impression this is a forum to share experiences... My question is posed from the perspective of seeing black when I try to "picture" something in my mind... It seems there are different levels of the manifestation of aphantasia. The article you refer to on pupilary response was also a part of what provoked my question. I believe it might be a big part of seasonal affective disorders. The essence of creativity and discovery is in connecting seemingly dissimilar concepts... I'm not a scientist. I had hoped there might be others with similar concerns or perspective. If you can't relate to the question, perhaps you should keep scrolling??