What you feel when you play the online poker is profoundly different from the experience during a real-life poker game. In real life, you experience the sensory overload: The gazes of people at you, the noises of dozens clay poker chips clattering together, the continuous flickers of twenty TV sets broadcasting six different sports channels, the odors of a thousand cigars past, and the tactual nature of the cards and the table, all assault your sensory perception simultaneously.
In the internet realm, your senses are strictly limited. The sounds you hear from the PC are inessential artifacts, or just duplicates of the real world noises, the sounds of shuffled card, chips clacking together, and the sound effects for folding and checking. The website adds them artificially; they do not have to be in there for the game to function properly.  Visual and motion information is very limited. The deprivation of typical sounds, sights and observations may cause you to focus more intently on a number of things you do see: the amount of an opponent’s bet, the time duration he needs to make the bet, and (to a much smaller extent) the conversation he has through the integrated chat system.  The more you urge yourself to focus on these elements, the better you can manipulate them to your advantage.