Writing the actual thesis statement can be one of the most daunting aspects of the essay.You are trying to make sure that it informs the reader of exactly what you are proposing, so they are clear on this from the beginning.You could equally argue that they have no effect, or that they are harmful.
This is not a problem, and is in fact all part of the scientific process.
Once you have written your essay, and are ready to proof-read, it is important to check your work and ensure that it actually addresses the thesis.
Importantly, a thesis is not the subject of the paper but an interpretation or point of view within that subject.
It is a specific claim you are making, and will be using the rest of the paper to argue.
Every single paragraph should be related to this initial statement in some way, or it risks drifting off into irrelevance.
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Your thesis statement should draw together all the background contained in your introduction and turn it into a single, powerful statement.
Think of your introduction like a space shuttle – only components that are absolutely necessary to performance be included in the design.
You could argue that operant conditioning is the major factor underlying the addiction, and set out to prove it.
Pavlov would still crop up in the paper, but as part of the background.