Georgia Tech Centers typically encompass multiple labs, a few of which are included in the "Labs" drop down under research. Considerable HCI research is conducted by individual faculty who are not associated with a lab or center. You can get a good sense of this by looking at individual faculty pages in addition to lab and center pages. Listed here are the Georgia Tech centers in which the majority of HCI-related research is located:

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Center for Assistive Technology and Environmental Access (CATEA)

Center for Research and Education on Aging and Technology Enhancement (CREATE)

Georgia Tech Center for Music Technology (GTCMT)

Georgia Tech Research Institute (GTRI)

GVU Center

Healthcare Design of the Future

Health Systems Institute

Rehabilitation Engineering Research Center (Mobility RERC)

Robotics and Intelligent Machines (RIM) Center

Georgia Tech Research Network Operations Center (RNOC)

Interactive Media Technology Center (IMTC)