I guess the best thing is to bridge what you learned to what you propose to learn. Like marketing, there are awful lot of topics you can link with psychology. Why Doctor of Philosophy? I guess in Lixue's case, these professors finally saw the connections between Philosophy and Accounting, and were willing to give the applicant a try. In others' case, though, they might have to propose such connection to the committee in their Statement of purpose. Some might be attracted, some might not. But a little some thing they will see in either condition is your insight.
我一直认为在business学术界,不管你model做成什么样,却积极少可以称作经典,而哲学家们不同,比如karl marx的capital, adam smith的the wealth of nations,ronald coase的the nature of the firm,这些人讲经济,讲商业真的是可以当作永远的bible。