If the bulb-apparatus physically took no input from the brain, if it was attached to the brain artificially (as opposed from being a native part of human body, or growing spontaneously—so that it couldn’t be considered a part of the brain), if its action was direct enough (e.g. implanting the decision by some sequence of electric impulses in course of seconds, as opposed to altering the brain only in a slight, but predictable manner, which modification would develop into the final decision after years of thought going inside the brain) and if the decision made by the bulb could be disentangled from other processes in the brain, then I certainly would not call the decision free. If only some of the above conditions were satisfied, then it would be hard to decide whether to use the word free or not.
I suspect we have unknowingly changed the topic into investigation of the meaning of “free”.
If the bulb-apparatus physically took no input from the brain, if it was attached to the brain artificially (as opposed from being a native part of human body, or growing spontaneously—so that it couldn’t be considered a part of the brain), if its action was direct enough (e.g. implanting the decision by some sequence of electric impulses in course of seconds, as opposed to altering the brain only in a slight, but predictable manner, which modification would develop into the final decision after years of thought going inside the brain) and if the decision made by the bulb could be disentangled from other processes in the brain, then I certainly would not call the decision free. If only some of the above conditions were satisfied, then it would be hard to decide whether to use the word free or not.
I suspect we have unknowingly changed the topic into investigation of the meaning of “free”.