What is Cognitively Stimulating in User Experience goal means?

I am an undergraduate from Computer Science major. Recently my lecturer ask his class to study about specific topic in user experience goals before the class next Monday. I read the ppt online and found that one of the user experience goals is cognitively stimulating. My country doesn't use english as primary language, and I have trouble in understanding what is "cognitively stimulating" means. As far as I search, here is what I conclude : "cognitively stimulating means a software / product must stimulate user brain to thinking and remembering". Is there any problems / mistake with my conclusion? Any help will be appreciated, Thanks before.