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Psych 2115 oct 30.docx

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Department
Psychology
Course
Psychology 2115A/B
Professor
Prof
Semester
Fall

Description
Psych 2115 Oct 30 Cowell (?) When the iSI is very short (less than 100ms), we expect to see a malgomation of the two stimuli that are being presented (some sort of malogmation of the letters and the circle- subject reports seeing the letter with a circle around it- same as experiment from last lecture how they saw disk with a circle around it) (1) Memory issues start to play a role The circle is the cue to report Another experiment- instead of the circle being the cue, they did a grid over the letter (2), when you have a cue like this, with a short ISI they blend together (like circle and ring= one big black thing), so performance is bad. Over time it gets better (3) The longer you give people to perceive the better they are at perceiving the letter. Perception of objects does unfold over time. So what is it that’s happening over time? Hubel and Weasel (?) (1962) Stick electrode down in skull of cat into visual cortext, present visual stimulus, see what the cat responds to. Present a vertical line and some cells go crazy, present horizontal and nothing happens - maybe perception is an accumulation of various lines of certain orientations. This gave a direction about how the perceptual system might be unfolding. This was how they tried to get machines to be able to read handwriting Selfridge (1959), Pandemonium Model: came up with a theory of how this all comes together: demons in your head, a bunch of levels of demons, first level is the image demon who encodes an image for us - gets the raw information, second level has feature demons - each one is responsible for different features (ie. curves, horizontal lines, etc.) they all have their feature that they respond to and start shouting and saying they see their feature, at the next level there are cognitive demons that are responsible for recognizing themselves- cognitive demon for letter A, start to get excited when they see the letter, listening to the feature demon and saying things like "I'm a letter T, do I hear these features?" if they do they start to get excited, which causes more pandemonium, the next level there is the decision demon who sits there and makes the call of what cognitive demon wins- what letter is this? Presented very briefly so you wouldn’t come up with the right answer very often, ask "what letter was presented?", why are we doing this? Creating a "confusion matrix": (4), if I present an A and you say A, I put a tick down from A to A, etc. Mistakes tell us that these stimuli must be similar and share features with one another. People just kept coming up with different types of features that were all different from each other. Wasn't telling us anything.
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