Introduction to Cognitive Psychology - Department of Psychological ...

Prof. Greg Francis 1/2/12Mind reading!! It is possible to build a recognition system that distinguishes (with71% accuracy) the brain patterns for addition and subtraction!! Depends on the place in the brain!! Different places for intention and execution!! You can read the mind of these subjects!Thought reconstruction!! Another research group analyzed fMRI responses toreproduce a shown imagePurdue UniversityPurdue UniversityThought reconstruction!! Performance depends on where the signals come from!! Fewer errors for “lower” brain areas!! Where do you stop?, the retina?, the lens of the eye?Purdue UniversityThought reconstruction!! These kinds of studies are mostly a demonstration oftechnology!! we already know the brain represents visual information!!! Before the study was run, we knew that there weredifferences in the brain when we see different images!! The percept is based on the brain, so there must bedifferences!!! These kinds of studies tell us that theneurophysiological differences between cognitiveevents can be measured by these brain scanningtechnologies!! A bit like statistical powerPurdue UniversityMind reading with EEG!! You can purchase an EEG device to read your mindand control a computer!! www.emotiv.comMind reading limits!! fMRI: If subjects decide to multiply numbers, a system trained todistinguish between subtraction and addition is clueless!! Thought reconstruction: As the number of possible images to beshown increases, it becomes harder to reconstruct the shownimage!! Emotiv: very limited set of mind reading possibilities!! This is a very limited form of mind reading!! People do better than this every day by watching people behave(posture, eyes, skin tone)!! The military and police are quite interested in these approaches!! Companies are interested in identifying what you think!! Proctor & GamblePurdue UniversityPurdue UniversityPSY 200: Intro. to Cognitive Psychology 3