A possible relation between the flow curvature and the reduction of electron thermal diffusivity is discussed. We show that unlike the flow shear, the flow curvature has no universal effects on the evolution of the two-point correlation function. Since various instabilities respond differently to the flow curvature, we can gain useful insights into the nature of the ambient turbulence responsible for the electron thermal transport by examining the profiles. Initial results from DIII-D and TFTR are discussed.