There are two basic types of behavioral experiments. In one type, you'll be hearing a word and you will be required to press a button, for instance, the left button if the word was a verb and the right button if the word was a noun. Quite often, you will hear a word that is not totally clear and we will ask you which of two words you heard. (E.g., was it áppel - the fruit - or appél - appeal.)
In another type of experiments, you might be asked to respond by speaking. Sometimes you will be asked to name a picture. On other occasions, you may be asked to repeat a sentence that was spoken in an unfamiliar accent of English.
Overall, these experiments are really easy for participants to do. We have to admit, though, that they can be a bit boring at times. But, after all, you get paid for doing something really easy.