Answer:
Independent variable- Whether or not participants were informed about epinephrine's effects.
Explanation:
The question above shows an example of a scientific experiment. As you already know, a scientific experiment is composed of variables, these variables are called dependent and independent.
The dependent variable is one that needs to be influenced by another variable to establish an observable result. On the other hand, the independent variable is the one that influences the dependent variable and that its manipulation is directly related to the observable result.
In the above experiment, he observed whether information about the effects of adrenaline injected on patients influenced the assessment of the emotional behaviors they exhibited during the experiment.
With this we can conclude that the independent variable refers to whether the participants were informed about the effects of epinephrine