Various editions of D&D have had a Feeblemind spell. Through each iteration has one been able to cast the spell on oneself and if so is a save required or optional? How has this changed throughout the different editions?
For the following editions of Dungeons & Dragons:
- D&D Expert Rules
- AD&D 1st Edition
- AD&D 2nd Edition
- D&D 3rd Edition
- D&D 3.5 Edition
- D&D 5th Edition
The spell allows a saving throw for each edition. Most editions allow you to willingly fail your saving throw. For others, the rules are silent on whether or not you need to attempt a saving throw against an ally's spell or your own.
This article does an excellent job comparing and contrasting the feeblemind spell across editions up to 3rd Edition. The way the spell targets a creature has changed very little across editions. All of them target a single creature and offer no reason why you wouldn't be able to target yourself. Note that the 1st and 2nd Edition feeblemind spell can only target magic-using creatures or spellcasters.
As far as I know, 4th Edition does not have a feeblemind arcane power.