The type of psychological disorder that attracted sigmund freud to the study of psychological factors in abnormal behavior would now be called

I believe the answer is: functional neurological symptom disorder

This disorders tend to cause the victim to experence various sysmtoms such as weakness, unability to move properly, blackouts, and sensory deprivation. From the perspective from a third party, these symptoms tend to be perceived as abnormal behaviour since ther is no physical attribute that associated with common sickness.