We are still doing brightness discrimination just as we were doing before Thanksgiving break with one big change. We are still using two rooms in the visual discrimination box with white paper as the positive stimulus and black paper as the negative stimulus. We also went back to letting our rats self-correct because Maisy had trouble with the punishment. The change is that Maisy is now being tested in dim lighting. We are going to measure the light this week so exact measurements will be available soon. She was having a lot of trouble with discriminating in the normal lighting, but once we switched to dim lighting, there was an immediate change.
You can see from the table below all of our data so far from the brightness discrimination task. Session 8 is especially interesting and there are special notes for that day. That was the day Maisy was switched to dim lighting. It appears Dr. Hample did very well that day, however, she only completed three trials. She would not leave the starting room and only did so three times. We do not know why she behaved that way because she was fed a similar amount of food and run in the same conditions as earlier.
Session 9 is also problematic because our rats had a five day break from the experiment. This break did seem to harm their performances so we will just have to see if they improve during the rest of the week.
The percentages in italics represent days Maisy was tested in dim lighting.
This figure shows the data from our brightness discrimination task in graph form so it is easier to compare their performances over time. Remember, for session 8, Maisy switched to dim lighting and Dr. Hample only completed three trials. For session 9, we had just returned from break so the rats both had five days off from testing.