Am I the only one who, while reading this post, thought “why doesn’t the same apply to anything else we ever discover”?
Elan vital (and phlogiston and luminiferous aether etc.) were particles/substances/phenomena postulated to try to explain observations made. How are quarks, electrons and photons any different? Just because we recognise these as the best available theory today, I am not sure I understand how one is a curiosity-stopper any more than the other.
The real curiosity-stopper is the suggestion that something is forever beyond our understanding and that attempting to research it is destined to be futile. Your quote from Lord Kelvin exhibits this mentality, but only very slightly. Certainly a lot less than some of that stuff you hear from religious people who think God explains everything but is beyond our understanding. I think the history of science shows that this mentality is continually diminishing, and Lord Kelvin’s quote may simply be a transitional fossil.
I still see traces of this mentality today. Ask a cosmologist what happened in the first few seconds after the big bang and they might say the particle horizon makes it fundamentally impossible to see beyond the point where the universe became optically transparent. I think many people think similarly about consciousness — not because they think we can’t dissect the brain and figure out how it works, but rather because they think we will never be able to come up wtih a coherent, useful definition of the term that reasonably matches our intuition. I think each of these are curiosity-stoppers.
Research shows that this doesn’t work for most people (but maybe it does for you). The reason seems to be that most people normally go and get what they want if they can. In order to turn something that you can always have into a reward, you would have to suppress this. Instead of rewarding yourself, you end up punishing yourself.
To use your example, you are not bribing yourself with Pinkberry frozen yogurt at all; you know that you can have your Pinkberry frozen yogurt whenever you want. You are actually denying yourself the Pinkberry frozen yogurt until you’ve finished the task. After the completion of the task you just restore normality. Every time your subconscious asks you, “I want Pinkberry frozen yogurt, why am I doing this to myself?”, your conscious comes back saying “Because I need to motivate myself to do this task I hate.” You begin to associate the task with Pinkberry-frozen-yoghurt deprivation and you start hating the task even more. Motivation goes down.
Furthermore, there’s the side-effect of having Pinkberry frozen yogurt at a time when you would normally not actually want it. You only have it in order to “reward” yourself for that task. Having Pinkberry frozen yogurt now itself becomes a task! You run the risk of compromising your love for Pinkberry frozen yogurt by forcing it instead of letting it happen naturally. Before you know it, Pinkberry frozen yogurt is no longer a reward. As soon as you realise this, you stop having it after the task, then you stop having it altogether because you associate it with the task you hate, and then you hate the task even more for destroying your fondness for Pinkberry frozen yogurt. Motivation goes down.
The only times this “self-imposed reward” system works on me is when the reward is intrinsically unavailable until the task is completed. For example, you could reward yourself for doing the shopping by buying Pinkberry frozen yogurt. You can’t have it until you bought it. But for other tasks (like writing an essay), that doesn’t work.