Looking on the internet deeply has found these results:

I have a great interest in psychology. is the most popular phrase on the web.

I have an extensive interest in psychology. 10 results on the web	I have a great interest in psychology. 142 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Mar 14, 2015 ... I chose this because I have a great interest in Psychology. It was my favourite class in high school. But do I want to be a psychologist? Will I be�... Nov 13, 2014 ... I have a great interest in psychology and political science, as a very close relative of mine is an analyst for the FBI. I appreciate your dedicated�... I have a great interest in psychology theory, I.O. business management, education, and academic advisement (k12 schools and colleges). Currently I am �... Apr 29, 2015 ... And just to note, while I have a great interest in Psychology, I'm currently not sure if I want to pursue it or not any more (at least not after this�...

I have an extensive interest in psychology.

10 results on the web

I have a great interest in psychology.

142 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Mar 14, 2015 ... I chose this because I have a great interest in Psychology. It was my favourite class in high school. But do I want to be a psychologist? Will I be�...
Nov 13, 2014 ... I have a great interest in psychology and political science, as a very close relative of mine is an analyst for the FBI. I appreciate your dedicated�...
I have a great interest in psychology theory, I.O. business management, education, and academic advisement (k12 schools and colleges). Currently I am �...
Apr 29, 2015 ... And just to note, while I have a great interest in Psychology, I'm currently not sure if I want to pursue it or not any more (at least not after this�...