A lot of efforts have been directed to enriching human-computer interaction to make the user experiencemore pleasing or efficient.\r\nIn this paper, we briefly present work in the fields of subliminal perception and affective computing, before we outline a new\r\napproach to add analog communication channels to the human-computer interaction experience. In this approach, in addition\r\nto symbolic predefined mappings of input to output, a subliminal feedback loop is used that provides feedback in evolutionary\r\nsubliminal steps. In two studies involving concentration-intensive games, we investigated the impact of this approach. In a first\r\nstudy evolutionary feedback loops adjusted the user interface of a memory game whereas in the second study the lighting of the\r\ntest room was adjusted dynamically. The results show that in settings with an evolutionary feedback loop test participants were\r\nable to reach significantly higher scores compared to the static counterparts. Finally, we discuss the impact that such subliminally\r\nworking applications might have on the user�s acceptance.
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