Thesis - Instituto de Telecomunicações

Appendix BTestsThe set of tests developed in the context of the present thesis are detailed in the followingsections. We created five distinct cognitive tests with the purpose of exposing the subjectto controlled cognitive situations from where the HCI, video and physiologic signals couldbe used to detect the cognitive state. The intention was primarily to have a set of signalsrelated to computer based activities to be used as new modalities of behavioral biometrics.The users started the tests in the web page depicted in figure B.1.In this appendix we describe how the tests were administered and present the scoringfunctions we used to compute a final test score that we provided to the user. We alsopresent a set of photos of the signal acquisition setup.B.1 Intelligence TestDescription. The intelligence test presents a set of questions with three figures on thetop that imply a fourth figure as the solution. The figures have three properties: color- red, yellow, blue or green; shape - circle, square, triangle or cross; number - one, two,three or four. The subject is requested to create the fourth figure by combining the threeproperties. The properties are composed via set of figures in the center of the screen. Ineach column the subject selects a value for each property. When the three options areselected a submit button appears that the subject can use to validate his answer. Duringthe question presentation time the user can recall the hints in the top of the screen andchange the property’s values.147