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I just finished an undergraduate degree in psychology, with a focus in biological sciences and pre-medicine courses. In looking at my options for graduate school, I've taken an interest in biomedical engineering; tissue engineering, medical devices, medical imaging, etc. My biology is pretty solid, but I'm not much of an engineer, aside from a few math courses. My question is, are students entering a PhD program typically very well-versed in the field, or is there a lot of "learning on the job"?

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While shan23's answer is good, it is also somewhat incomplete. There are a few things to watch out for when you're coming in to a field from another department:

  • You will need to keep in mind the qualifying procedures for your new department. Will they expect you to pass exams in undergraduate coursework in the new discipline? If so, then you'll need to do a lot more "catch-up" work early on to make up for the potential shortfall.

  • Unless the new area is an interdisciplinary one—such as biomedical engineering—they're probably going to want to see some track record in the area. You're going to find it a lot easier to move into biomedical engineering from mechanical engineering than from economics.

  • You may find it helpful to try to find a position as a lab assistant or something similar to this in the new field before you try to start the graduate coursework. However, this is by no means required. (But it would help to prove the "dedication" aspect, which is what you'd need to convince a graduate school admissions committee about in order to have a successful application).

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  • +1 for the idea in your second point. In BioEngineering, many students are able to successfully enter the field from a very wide range of backgrounds (comp sci, math, neurosci, bio, others), because it's such a diverse field. Students entering less interdisciplinary fields would have much more difficulty. – eykanal Feb 24 '12 at 13:26
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I had asked the same question related to CS in TCS.SE (found here) - from that, I'm summarizing the answers I got w.r.t your field:

  • Before grad school is a very early stage to change fields. Many people shift then. It's acceptable and expected. In your application, explain your changing fields (so the readers understand why the letter writers are not from psychology, why you took lots of biology courses, etc)
  • If you have research experience (especially if there's some angle towards biological subjects in them), it still counts for you, even if it's in a different field
  • If you have good grades, it still counts for you, even if they are for courses from a different field.
  • Admissions committees are generally looking for "strong" students where "strong" is largely defined via prior research experience. i.e. they especially want to know if you've had the experience of doing research, were successful at it and have a good idea if this is something you really want. The letters are important as experienced researchers' evaluation of your research ability and potential and grades give some indication of overall academic aptitude. Thus, if you have strong letters from your supervisors, it still counts for you, even if they are from a different field (strong = from a professor who knows you well and has great things to say about you).
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