Attention can be divided into two types: seemingly attentive and seemingly inattentive. Attention seems to mean paying attention to something on the surface, but actually thinking about something else in mind. Inattention seems to mean that you don't seem to pay attention to something but actually pay great attention to it in your heart.
The statement 'Near lunchtime, the meeting is not over yet. Although many attendees appear to be listening carefully to the content of the meeting, they are thinking about what to eat for lunch' does not seem to pay attention to according to the above definition.