I also carried out a research work on the effect of alcohol on learning memory in rats using the Y-Maze . The result was quite similar to your findings. The rats that took the moderate alcohol had the best memory test results.
Heavy Drinking in Middle-Aged Men Found to Speed Cognitive Decline — Physician’s First Watch
Heavy Drinking in Middle-Aged Men Found to Speed Cognitive Decline
By Joe Elia
Middle-aged men drinking 36 g or more of alcohol per day (roughly equivalent to three 12-oz. bottles of beer, or three glasses of wine, or three shots of liquor) experience more rapid cognitive decline than those drinking moderately or less, according to a Neurology study.
Some 5000 men and 2000 women — all British civil servants — self-reported their alcohol consumption levels three times over a 10-year period. Then, over the ensuing 10 years, beginning at roughly age 56, they underwent cognitive testing on three occasions to measure age-related declines.
Declines were steeper among men who were heavy drinkers. In women, an effect was seen starting at the 19-g/day consumption level, but it did not reach statistical significance. The authors say the decline among heavy-drinking men showed an effect size ranging from 2 to 6 extra years of cognitive decline over the 10 years of observation.