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The first image is bright and photographic, levels 2 through 4 show increasingly simpler and more faded images, and the last—representing complete aphantasia—shows no image at all. Aphantasia (/ ˌ eɪ f æ n ˈ t eɪ ʒ ə / AY-fan-TAY-zhə, / ˌ æ f æ n ˈ t eɪ ʒ ə / AF-an-TAY-zhə) is the inability to visualize. [1]
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The condition where a person lacks mental imagery is called aphantasia. The term was first suggested in a 2015 study. [28] Common examples of mental images include daydreaming and the mental visualization that occurs while reading a book.
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Most people showing amazing memory abilities use mnemonic strategies, mostly the method of loci. This includes all winners of the annual World Memory Championships and most of the known scientific cases of excellent memories, like Solomon Shereshevsky. Regardless, the following list contains people who have claimed photographic memory. [4]
Autobiographical memory (AM) [1] is a memory system consisting of episodes recollected from an individual's life, based on a combination of episodic (personal experiences and specific objects, people and events experienced at particular time and place) [2] and semantic (general knowledge and facts about the world) memory. [3]
When a person has Alzheimer's disease, "the brain cells and the brain networks start to die [and] there is dysfunction in terms of the person's ability to cognitively process things," Devi says.