You cannot impose a reward schedule on yourself...
I complete a task, I roll a d4 once, and in case of success I eat a chocolate. What exactly is the problem with this?
I am not a psychologist, but it seems at least plausible that getting a chocolate one time in four because you saw yourself roll a die and chose whether to eat a chocolate depending on the result might have different motivational effects than getting a chocolate one time in four according to some mechanism competely opaque to you.
http://measureofdoubt.com/2011/04/12/pulling-levers-killing-monsters-the-lure-of-unpredictable-rewards/ (how do I put a link like this in a word with blue letters?)
I've read that unpredictable rewards associated with a behavior actually encourage that behavior more effectively than consistent rewards.
The optimal habit-forming figure given in the link above is a 25% chance of reward for each instance of performing the behavior.
My hypothesis then, is that if I want to establish a habit by rewarding myself upon successfully performing a certain task, I should reward myself only 25% of the time if I want to ingrain the habit as forcefully as possible into my unconscious.
Anyone else think so, or have any other research to add?