  Lack of vivid sensory imagery has recently become an active subject of
research, under the name of aphantasia. Extremely vivid imagery, or
hyperphantasia, is at the other end of the spectrum of individual differences.
While most research has focused on visual imagery in this paper I argue that
from a neuropsychological perspective this phenomenon is much more widespread,
and should be categorized as imagery sensory agnosia. After over twenty years
of learning to play music phenomenology of auditory imagery agnosia is
described from the first-person perspective. Reflections on other forms of
imagery agnosia and deficits of autobiographical memories are presented and a
hypothesis about putative brain processes that can account for such phenomena
is discussed. Extreme individual differences in imagery and in autobiographical
memory have implications for many fields of study, from consciousness research
to education.
