Laboratory from perception

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Presentation transcript:

Laboratory from perception Engineering Psychology Cognitive processes Laboratory from perception http://en.wikipedia.org/wiki/Perception http://www.cns.nyu.edu/~msl/courses/0044/handouts/Weber.pdf http://en.wikipedia.org/wiki/Weber%E2%80%93Fechner_law http://www.wikiskripta.eu/index.php/Weber-Fechner%C5%AFv_z%C3%A1kon http://en.wikipedia.org/wiki/Psychophysics#Experimentation http://en.wikipedia.org/wiki/Gestalt_psychology#Uses_in_human.E2.80.93computer_interaction http://www.sapdesignguild.org/resources/optical_illusions/gestalt_laws.html http://en.wikipedia.org/wiki/Memory http://www.akademik.unsri.ac.id/download/journal/files/scipub/jcs_si_106-111.pdf Jakub Jura Jakub.jura@fs.cvut.cz http://users.fs.cvut.cz/~jura/ing-psych/

Lab 1 - Perception Emmert law Weber law Fechner law Discrimination Thresholds Haptic sensitivity Blind spot

Emmert’s law Emil Emmert (1844 - 1911) Emmert law: The afterimage size changes proportionally with its distance from the observer. a a’ l l’

Weber law Ernest Heinrich Weber (1795–1878) Experiment with weight difference Just noticeable difference (jnd) between two weights was approximately proportional to the mass of the weights I = kw* I I … Base intensity (Total weight) I … Discrimination threshold (Weight difference) kw Constatnt (Weber Fraction) We can‘t perceive the intensity of stimulus directly, but in relation to the reference value.

Fechner law Gustav Theodor Fechner (1801–1887) Dependence of sense impression on the intensity of stimulus is logarithm. P = k * ln (S) P … percept k … constant S … stimulus

Fechner law

Weber-Fechner law Weber-Fechner principle in the acoustics: LI=10 log (I/I0) Lp=20 log (pe/pe0) L … Level of intensity I … Intensity P … Aacoustic pressure I0, pe0 ... Minimal perceived value

Discrimination threshold In acoustics http://tonometric.com

Haptic sensibility Tactile compasses The brain – projection zone. Skin surface and brain surface.

Blind spot Close the right eye. Leave your head in the central position. Look to the cross, by the left eye. Approach your head to the paper. The circle disappears in a given distance.