In psychology Concepts refer to:

concepts. A mental grouping of similar things, events, and people that is used to remember and understand what things are, what they mean, and what categories or groups they belong to. basic level type.

Explanation:

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

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