Dr. james deliberately varied facial symmetry in a series of photographs and later measured participants' liking for the faces. which type of research method did dr. james use in this scenario?

Experimental. Dr James used an experimental model of research for his study which involved facial symmetry. Experimental studies basically comprise of an independent and dependent variable. The goal is to observe if the independent variable has an effect on the dependent variable, and if it has how strong and where is it heading? This is how an experimental study is performed.