Solving T-shaped maze (probability learning): differences between rats and humans
I was unable to find this in a scientific paper, and it is not clear from the sources I did locate that this work was ever actually published. However, I found other sources that reference this work and several similar studies comparing humans to rats. 

The study you mention is also referenced briefly in Tetlock's (2005) book on political judgment; a discussion of Tetlock's interpretation of the results can be seen on University of Pennsylvania's Language Log (2005). That blog post also indicates the experiments are discussed to some extent in a textbook by Gallistel (1993); finding that book may provide more information. 

A paper by Spragg (1934) describes exploring anticipatory responses in both rats and human (student) subjects. Overall and Brown (1959) examined decision making behavior in rats and humans (students) using a maze task. 


Gallistel, Charles R. (1993). The organization of learning (Learning,
development, and conceptual change). A Bradford Book: 662 pages.
ISBN-13: 978-0262570985
Language Log. (December 11,2005). Rats beat Yalies? Doing better by
getting less information? Retrieved from
http://itre.cis.upenn.edu/~myl/languagelog/archives/002700.html
Overall, J. E., &amp; Brown, W. L. (1959). A comparison of the
decision-behavior of rats and of human subjects. The American Journal
of Psychology, 72(2) 258-261.
Spragg, S. S. (1934). Anticipatory responses in the maze. Journal of
Comparative Psychology, 18(1), 51-73.
Tetlock, P. (2005). Expert political judgment: How good is it? How
can we know?. Princeton University Press. ISBN-13: 978-0691128719