In what century did Indian writers take a new interest in social questions and psychological descriptions ?
More recently , William R. Aho , Professor Emeritus of Sociology at the Rhodes College , raised questions about " Sisu " , and stated that “ we need a good deal of organized , systematic scientific research to discover the scope and depth of " Sisu " , geographically and situationally , and the depth and strength of both the beliefs and behaviors surrounding and emanating from sisu . ” A recent study aimed to fill in that gap , and offer a more precise language for discussing the term .