Final answer:
Concepts are mental representations of things or events, constructs are abstract concepts used in theories or research, and variables are measurable attributes that can vary.
Step-by-step explanation:
In psychology, concepts are ideas or mental representations of things or events that share common characteristics. They can be complex and abstract or more concrete. For example, Piaget's stages of development is an abstract concept in psychology. Another example is the concept of tolerance, which can vary from person to person.
Constructs, on the other hand, are abstract concepts that are specifically created for a particular theory or research study. They are used to explain or represent certain phenomena. In psychology, constructs can include things like intelligence or personality traits.
Variables are measurable attributes or characteristics that can vary or change in a research study. In the context of the question, self-care can be considered a variable because it can have different levels or forms. For example, self-care can be measured using indicators like frequency of exercise or quality of diet.