Spatial and verbal codes and the capacity of STM

Subjects were required to report an array of consonants presented tachistoscopically for various durations. Concurrently, they held in memory a load of auditory digits, a load of spatial locations or no load. These several forms of information did not seem to compete for a fixed capacity short term store. Consonant report was unaffected by carrying a spatial load and barely affected by carrying the auditory digit load. An auditory-verbal loop cannot play a mandatory role in the coding and storage of visual information. Some criticisms of structural interpretations of immediate memory are suggested.     

The effects of lexical and semantic information on same-different visual comparison of words

Previous research has indicated that phonemic and orthographic factors cannot account for the fact that words (clear/clear) are responded to more rapidly than orthographically legal nonwords (creal/creal) in a same-different visual comparison task. However, the role of semantic and lexical factors is less certain. The effects of semantic similarity on both same and different judgments were evaluated in several experiments. In the first experiment, subjects were not any slower on semantically related (rang/rung) than on unrelated (rang/rank) different judgments even with a 3,000-msec interval between the first and second word. In Experiment 2, subjects based their judgments on whether or not the first letter of each word was visually identical. Same judgments were not any faster for semantically related than unrelated items even though other evidence indicated that subjects were processing the whole word and not just the first letter. Experiment 3 showed that the word/orthographically legal nonword difference could be replicated with the first-letter visual comparison task employed in Experiment 2. These and related results were discussed with reference to the idea that the word/orthographically legal nonword difference is due to the facilitating effects of a lexical entry upon the encoding, but not the comparison of an item.     

Stimulus novelty and intraseries primacy in GSR adaptation

GSR records were obtained for four groups of 20 Ss. Group I was presented with a series of four different lights (amber, blue, green, and white) appearing 20 times each, in apparent random order. The procedure was similar for the other three groups except that in group 2, a novel stimulus (a red light) appeared instead of the sixth amber light; in group 3, it appeared instead of the 16th amber light; and, in group 4, it appeared instead of the 16th amber light. Typical GSR adaptation phenomena were observed in all groups. The introduction of the novel stimulus appeared to have no effect on the course of GSR adaptation.     

Effects of fixed-time shocks and brief stimuli on food-maintained behavior of rats

When a fixed-time schedule of shocks was presented to rats lever pressing for food on a random-interval schedule, a pattern of behavior developed with a high rate of pressing after shock declining to near zero before the next shock was delivered. Once this pattern had stabilized, one-quarter of the shocks were replaced with brief auditory stimuli (tones) in a random sequence. Tone maintained behavior similar to shock, although tone was never paired with shock. Both tone and shocks elicited responding when presented at various times as probe stimuli, and responding was usually totally suppressed if neither stimulus occurred at the beginning of the fixed-time interval. When other stimuli were paired with tone and shock, only those paired with tone gained discriminative control and elicited responding. These findings suggest that stimuli that signal a shock-free, or safe, period will maintain the pattern of behavior generated by shock on a fixed-time schedule. There is a parallel between this phenomenon and the control of behavior on second-order schedules of positive reinforcement with nonpaired brief stimuli.     

How would a latent period for early breast cancer affect the benefit of screening?

The ideal goal of a screening program for breast cancer is to detect the disease at a stage when it is still curable by a simple lumpectomy. This goal would be possible if the tumor had an early latent period before it was vascularized. However, even if there existed a harmless screening examination that was sensitive enough to discover the cancer at this stage the benefit to be gained from a screening program would be highly dependent on the time the tumor spends in the latent stage as well as on the chance of false negatives at the examination. Calculations derived from a mathematical model suggest a variety of theoretically possible situations including: (1) For certain cancers screening every three years would offer almost as much benefit as screening every year; (2) A large increase in the sensitivity of a screening examination does not necessarily lead to a large increase in the benefit of a screening program; (3) For certain cancers the benefit of screening might remain low no matter how sensitive the examination used.     

Units of phonological recoding of word-like stimuli used by children and adults

Third-grade, sixth-grade, and coUege-age subjects performed a “same”-“different” task, using a phonological identity criterion for visually presented pseudowords. Consistent with Krueger’s (1978) model of single-glance “same”-“different” judgments, judgments of phonologically matching stimuli were made more quickly and less accurately than were judgments of phonologically nonmatching stimuli, and error rates and RTs were longer for phonologically similar nonmatching pairs than for phonologically dissimilar nonmatching pairs. It was concluded that subjects of all ages tested could process phonologically recoded information in a holistic fashion, and the implications of these conclusions with respect to reading processes are discussed.     

Children's occupational sex-typing

Preschool and elmentary school children responded to questions measuring sex-typing of attribution (who would like this job), service preference (who the child would choose to do this job), and personal job choice (would the child like to do this job) dimensions for each of nine jobs, and stated a free-choice job preference. A subsample completed a cognitive classification measure. With age through second grade attribution and service preference sex-typing increased; generally, the match scores between the three aspects and census reality increased; the use of sex-typed categories in service preference decreased. For some aspects, girls were less sex-typed than boys; for others, each sex showed own-sex bias. Age, not classification skill, accounted for more variance in the sex-typing measures.This research was supported in part by an Indiana University Grant-in-Aid for dissertation research awarded to the first author. A shorter version of this article was presented as a paper at the annual meeting of the American Psychological Association, Toronto, 1978. The authors would like to thank the children, parents, and school personnel in all five cooperating schools, including Central Elementary School, David Satter, Principal; Children's Corner Cooperative Nursery School, Sue Yamaguchi, Director; Christian Center Day Care Preschool, Monroe County United Ministries, James Fisbo, Executive Director, Jean K. Lloyd, Preschool Director; St. Charles School, Kathleen Fleming, Principal.