Alston offers a detailed discussion of our grounds for taking sense perception and other sources of belief including introspection, memory, and mystical experience to be reliable and to confer justification.
Bradley (2009) distinguishes many distinct sources of imperfect introspection.
The episode has been a source of outrage and introspection at the institution for months.
Even so, he told her that he needed time before spending ninety dollars on a garment that had been the source of so much introspection.
Historically, thinking was associated with conscious experiences, but, as the scientific study of behaviour (e.g., behaviourism) developed within psychology, the limitations of introspection as a source of data became apparent; thought processes have since been treated as intervening variables or constructs with properties that must be inferred from relations between two sets of observable events.
But since there is no clear consensus as to how to evaluate the results of introspection, or what weight to accord other sources of evidence about mental states, such as external stimuli and behavior, introspection faces an especially thorny and complex problem of calibration.
My very good friend Marie Colvin, of the London Sunday Times, was recently killed along with another colleague in Syria, and it's been a source of great grief and sorrow and introspection and loss.
Alternatively, one could view introspection as a source of certainty.
However, taking introspection to be a source of scientific knowledge led to disquiet when introspectors failed to agree about what, if any, distinctive introspectible item they had found in experiencing pleasure.
The history of introspection reconsidered.
