Hi

I am trying to find out what visual psychophysical studies have been performed on amphibians (e.g. measurements of spatial acuity, pattern recognition, color sensitivity etc). I would be very grateful if anyone could point me to a good resource be it a book, journal article or webpage. I am especially interested in how the amphibians were trained to "cooperate" in the experiment.

Also, I am trying to find out the names of the main researchers in this field.

Many thanks
Piers