The belief that some distressing physical symptoms could not be readily explained in terms of neurological impairments contributed most directly to:

The correct answer is unconscious conflicts.

According to the psychologist Sigmund Freud, some physical symptoms that do not appear to have a neurological or physiological basis can be explained in terms of unconscious conflicts. Unconscious conflicts refers to feelings or thoughts that we are not consciously aware of, but nevertheless these thoughts and feelings manifest in the form of distressing physical and even psychological symptoms. 

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