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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Reflex hallucination is a morbid variety of
assistant
The correct answer is  Reflex hallucinations,also called Synaesthesia, is the experience of a stimulus in one sense modality producing a sensory experience in another. For example, the feeling of cold in one's spine on hearing a fingernail scratch a blackboard. Reference:Fish's Clinical Psychopathology, 3rd edition, page 27.