Back in 2019, I included the following in a tangent near the end of a longer post:
“The thrust of the famous cogito ergo sum was already anticipated in Augustine’s Confessions. A more detailed version was developed by Avicenna, in an argument known… as the “flying man”. He proposed a thought experiment, considering someone in counterfactual absolute sensory deprivation from birth, with the intent of asking whether awareness could be completely independent of sensibility. He argued that the person in absolute sensory deprivation would still be aware of her own existence, due to a pure immediate reflexive awareness intrinsic to the soul and independent of the body. This kind of claim would have been accepted by Plotinus, but rejected by Aristotle or Hegel. Medieval Augustinians, however, enthusiastically adopted many of Avicenna’s ideas.” Peter Adamson, a scholar of Islamic philosophy, has a nice short article on this.