Briefly explain the procedure of Cheesman and Merikle experiments (1984) and (1986) and explain the results.
In the experiment by Cheesman & Merikle (1986!, subjects were presented with one of four colour words. On each trial, subjects had to say which word had been presented. Even if subjects believed they saw nothing, have to guess something. After each block of 40 trials, the stimulus onset asynchrony (SOA) was reduced until subjects were performing at chance. After each block of trials, subjects estimated how accurate they had been. The results indicated that the subjective threshold is reached at a higher SOA than the objective threshold, meaning that the two thresholds are different. It was also found that stroop priming is obtained for colour words presented below the subjective threshold, but not below the objective threshold. Thus, it was concluded that unconscious processing takes place below a subjective threshold.
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