[OS X Emacs] LaTeX subscripts in Aquamacs

[Michael Thaddeus]

Hi everyone,

When I edit a LaTeX file in Aquamacs, it has the cutesy habit 
of rendering the input for subscripts and superscripts in a smaller 
font, so they look like actual subscripts or superscripts.  E.g. in the 
expression e^{i \pi}, the text {i \pi} is rendered as a superscript.  
I dislike this for 2 reasons:

(1) it is hard to read;
(2) it can be misleading: e.g. the subscript of x_1 looks like -1. 

How can I customize Aquamacs (on Mac OS X) to prevent it from doing this?

Many thanks...
Michael