Thesis - Instituto de Telecomunicações

58 CHAPTER 3. INFORMATION SOURCESThe usage of the same interaction monitoring system guarantees the synchronization of thisannotation with all the other signals.3.4.6 Final Check-upA final check-up in the physical sensor positioning was performed, verifying all sensorsand the respective acquired signals quality. A synchronization check was done asking thesubject to press the left mouse button and identifying the event in the WIDAM system, inthe physiologic acquisition system and in the camera LED.3.4.7 Material (The Tests)A set of cognitive tests were designed for the purpose of studying the behavior and the physiologicalreaction under diverse cognitive situations. The tests are: Memory, Association,Intelligence, Discovery and Concentration. A detailed description of the tests is given inannex B, where specific information can be found with a brief description, the goals, and thedata recorded in each of the tests. The conceptual idea behind each of the test is detailedin its goals. The main intention was two two-fold: elicit some cognitive state and haverich interaction webpage to stimulate the mouse navigation in the webpage. Consideringthe pointer dynamics biometric system, we devised tests that require more user interactionactivity, producing more interaction events, such as mouse movements, mouse clicks or keypresses, per second, than normal computer interaction in web browsing, mail reading, ordocument producing. As an example, the memory game was selected to collect interactiondata related to the strategy used by the user while solving the game. The interaction signalsrecorded while the user is selecting the different tiles.3.5 DiscussionThe project for acquiring HCI and physiological data from subjects provided some resultsworth mentioning.The experience on the physical application of all the electrophysiological sensors learnedby the research group, created a rich knowledge background for signal acquisition sessions.The collected signals were organized in a database available to the researchers through a