Roger is at a party talking and laughing with a group of friends. He sets his plastic soda cup down and seconds later picks up the glass mug that someone put in its place. He fails to notice that the drink was replaced. This is an example of

lack of attention

Explanation:

Simply placed, relatively little attention could be characterized as reduced processing power, which inevitably implies rivalry for consideration. The word inattention generally means that, at such a given time, the item to be tended to is just not what it was supposed to or not what it would be dynamically. Thus, from the above we can conclude that the given scenario illustrates a case of inattention.

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