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Experiment Author Baranski, J.V & Petrusic W.M Adapted from STEP and used with permission of Brian MacWhinney
This experiment compares performance on perceptual and knowledge tasks. The goal is to measure whether people expect their performance to be better than it is on either or both tasks. The original study concluded that performance was similar on both types of task.
The script presents a series of questions and a series of pictures, each with two possible answers. The participants are supposed to decide which of the answers is correct and then provide their confidence in their answer.
This experiment has two counterbalanced trials. Each trial will present 32 samples. The knowledge-based list will select 32 questions randomly from a list of 156 total questions. The trial that tests perception confidence cycles randomly through a list of 32 samples. There are images presented that are vital to the functioning of the experiment. These files are included in the download.
"On the calibration of knowledge and perception". Canadian Journal of Experimental Psychology, 49, 397-407
Experiment Abstract or Original Experiment Abstract
This study examined confidence judgments (i.e., calibration, resolution, and over/underconfidence) and response times in an intellectual knowledge task and a perceptual task requiring location comparisons. At each of four levels of judgment difficulty (i.e. Easy, Hard, Impossible, and Misleading/Illusory), very similar properties were evident in the two tasks. The results are inconsistent with theories that assume a fundamentally different basis for confidence in human knowledge and perception.
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