Differential observing responses (DORs) are additional response requirements used to promote orientation to a stimulus in a discrimination task. Farber and Dickson (2023) recently provided a DOR taxonomy, and these authors reported that no prior research has compared the effects of distinct DOR requirements. We compared the effects of two DOR…

It is common to see mirror errors in letters in early stages of reading due to the mirror-generalization process that allows a visual stimulus to be identified independently of its orientation. To avoid such errors, this process must be inhibited. A special case would be children with dyslexia since their difficulties with the alphabetic code may…

This study consisted of two experiments. In the first experiment, 40 college students gave frequency ratings for concrete and abstract words which were equated on normative frequency. From the results it was concluded that abstract (low imagery) words, even though the two sets of words are of equal frequency. In the second experiment, different…

A well established finding in the discrimination learning literature is that pictures are learned more rapidly than their associated verbal labels. It was hypothesized in this study that the usual superiority of pictures over words in a discrimination list containing same-instance repetitions would disappear in a discrimination list containing…

This experiment was a direct test of the hypothesis that picture-word differences in discrimination learning are a function of apparent frequency differences associated with two types of material. The subjects consisted of 80 sixth graders randomly selected from two elementary schools located in middle-class neighborhoods. Each subject was tested…