The question in the title, although meant to be general, is mainly motivated by a specific type of Near-Death Experience (NDE) that currently perplexes me. Specifically, I am referring to NDEs recounted by individuals blind from birth who claim to have had experiences resembling 20/20 vision. This topic is discussed in detail in a journal article titled Near-Death and Out-of-Body Experiences in the Blind: A Study of Apparent Eyeless Vision, Kenneth Ring, Ph.D. Sharon Cooper, M.A. University of Connecticut. Journal of Near-Death Studies, 16(2) Winter 1997. 1997 Human Sciences Press, Inc.
In the article, the authors put forward Eyeless Vision and Transcendental Awareness as their most reasonable explanation for these sorts of cases, after having eliminated one by one four candidate naturalistic hypotheses, namely, (1) the Dream Hypothesis, (2) Retrospective Reconstruction, (3) Blindsight, and (4) Skin-based Vision.
The Abstract:
ABSTRACT: This article reports the results of an investigation into near death and out-of-body experiences in 31 blind respondents. The study sought to address three main questions: (1) whether blind individuals have near death experiences (NDEs) and, if so, whether they are the same as or different from those of sighted persons; (2) whether blind persons ever claim to see during NDEs and out-of-body experiences (OBEs); and (3) if such claims are made, whether they can ever be corroborated by reference to in dependent evidence. Our findings revealed that blind persons, including those blind from birth, do report classic NDEs of the kind common to sighted persons; that the great preponderance of blind persons claim to see during NDEs and OBEs; and that occasionally claims of visually-based knowledge that could not have been obtained by normal means can be independently corroborated. We present and evaluate various explanations of these findings before arriving at an interpretation based on the concept of transcendental awareness.
The authors add:
An Assessment of the Evidence for Alternative Explanations
Our search for a non-retinal-based mechanism that could in principle account for the results of this study and thus demonstrate that vision in the blind is indeed only apparent and not actual has considered theories and data relating to dreams, retrospective reconstruction, blindsight, and skin-based vision, and has come up empty. Of course, it would be absurd to claim that we have exhausted the list of naturalistic or conventional possibilities or eliminated all conceivable artifacts, but we believe we have ruled out some of the most obvious candidates for explanatory honors. At the very least, we have perhaps managed to cast some doubt on the tenability of this type of explanation for our findings, and consequently increased the likelihood that however they might be accounted for, we would do best to seek elsewhere for our answers.
And also:
Theories of Transcendental Awareness
When confronted with the evidence for transcendental awareness we have presented in this paper, both from our own study and from the research of others, it is obvious that the generally accepted theories of human perception and cognition that derive from mainstream science will not, without some extraordinary extrapolations, be able to account for such findings. If, however, we turn instead to some recent theoretical developments in New Paradigm Science we can quickly discern the shape of the explanation we need to seek.
In recent years, a number of thinkers, influenced by developments in modern physics, have elaborated a variety of theories of consciousness which, despite their somewhat different basic postulates, all either predict or imply that blind persons should be able to have something like visual perception during NDEs and OBEs. In addition, all of these theories explicitly address the phenomenon of the NDE in general and also posit the existence of a state of consciousness that corresponds to what we have called here transcendental awareness. Among such formulations are Kenneth Arnette's "Theory of Essence" (Arnette, 1992, 1995a, 1995b), Larry's Dossey's "Nonlocality Theory of Consciousness" (Dossey, 1989), Amit Goswami's "Quantum Theory of Consciousness" (Goswami, 1993, 1994), Michael Talbot's "Holographic Theory of Consciousness" (Talbot, 1991), and Jenny Wade's "Holonomic Theory of Consciousness" (Wade, 1996).
Are we justified in exploring explanations that go beyond conventional physics and naturalism when all known physicalistic/naturalistic explanations appear to be inadequate?
BONUS: For those who are curious and have some time to spare, you can watch a 33-minute video here featuring an interview with one of these blind-from-birth NDEers (title: Vicki Noratuk Blind Person NDE). This case is quite impressive, and is actually referenced by the aforementioned journal article (Disclaimer: the YouTube channel hosting the video has an evident religious bias).