Klein Lab

University of California, Berkeley | Vision Science Program

David Kim

Research Interests:

As a student of joint UC Berkeley / UCSF bioengineering doctoral program,  my current interest involves determining the spatial and temporal localization of early visual areas such as V1, V2, and V3. Visual experiments are of particular interest to me because so much of human evolution and life revolves around visual observations. However, visual experiments are also difficult for source estimation because various visual sources are in close proximity from one another. Disambiguating close sources are notoriously difficult for source separation, so naturally, it presents an exciting engineering challenge for me.


In terms of biomedical imaging systems, we are presently at an interesting time in history in that there are imaging equipments to determine either the location of a source (f/MRI with millimeter resolution) and the timing of a source (M/EEG with millisecond resolution), but no single equipment exists that can do both simultaneously. My research interest in Klein lab is to combine the state of the art imaging techniques that are currently available to advance the present limits of source estimation in visual experiments.


As mentioned before, disambiguation of close sources are difficult without additional constraints. In order to address the issue of disambiguation, my predecessors at Klein lab have introduced a key concept that we call common time function (CTF) assumption. When various locations in visual areas are presented with identical stimulus, CTF makes the assumption that the responses from visual areas will be identical (i.e. V1 time functions responding to visual stimuli at various locations are identical). This concept has been used by several leading laboratories in the vision search and is directly responsible for their success in separating V1 and V2. My current research involves using CTF to modify existing forward models and is funded by NSF grant (NSF Grant: 1063415). If anyone is interested in learning more about CTF or our current efforts to improve the state of the art forward models, please contact us directly for further discussions.


Aside from research, one fun thing I learned after coming to the Klein lab is to ride a motorcycle (courtesy of Weston Pak, one of the other graduate student in our group). We are always looking for more wingmen.



2004 - B.A. in Business Management, UC Santa Cruz

2007 - B.S. in Bioengineering, UC Berkeley

2012 - Ph.D. (expected) in Bioengineering, UC Berkeley

Kim photo


Email: dkim@berkeley.edu