Processing time as influenced by the number of elements in a visual display

In a visual-detection experiment. a display of several letters was presented. and S was to report the presence or absence of a given target letter. Results clearly are incompatible with a self-terminating visual-scanning process as hypothesized by Sternberg (1967). Two models are considered. a serial exhaustive scanning process and a parallel exhaustive process, but findings from the present study do not provide a basis for differentiating between them.     

Sex-role identity,sex of other,and affective relationship as determinants of interpersonal conflict-management styles

Previous research in sex-role identity has explored behavioral differences in a variety of contexts. Only recently, however, have differences in interaction style been investigated. The study reported here was designed to assess behavioral differences in one important type of interaction: interpersonal conflict. Of 143 college students responding to the Bem Sex-Role Inventory (BSRI), a final sample of 57 subjects provided questionnaire data on five conflict-management modes in hypothetical conflicts with others who varied on factors of sex and affective relationship with respondent. Results of the MANOVA analysis suggested that feminine persons disapprove of competition more than persons of masculine and androgynous sex-role identification. The results further suggested that masculine persons may differentiate less between liked and disliked others in their competitive behavior than do feminine and androgynous persons. Finally, results suggested that conflicts with liked, as opposed to disliked, others are managed with less competition and more accommodation, collaboration, and compromise for all sex-role identity groups.     

Semantic effects in visual word detection with visual similarity controlled

In three experiments, subjects searched through word lists for a single target word. Search was faster when the target word belonged to a different semantic category from that of the background words with visual similarity controlled. This semantic effect increased with number of items to be searched through, and it obtained whether the target was cued visually or verbally. Semantic homogeneity within the background also speeded search, but only when subjects had no prior knowledge of the nature of a list. Several models of the semantic effect are described. All contrast the encoding of physical identity with the encoding of semantic attributes, but they differ in ascribing the effect to: (1) the relative access times for these codes, (2) the power of the codes in dealing with multiple comparisons, or (3) the attentional demands of comparison using different levels of code.     

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.     

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.