The attentional blink reflects retrieval competition among multiple rapid serial visual presentation items: tests of an interference model

When people respond to a target (T1) in a rapid serial visual presentation stream, their perception of a subsequent target (T2) is impaired if the intertarget stimulus onset asynchrony is between about 100 and 500 ms. Three experiments supported the interference model's (K. L. Shapiro, J. E. Raymond, & K. M. Arnell, 1994) claim that this attentional blink reflects competition for retrieval among multiple items in visual short-term memory. Experiments 1 and 2 revealed that items appearing during the blink are named as T2 on an above-chance proportion of trials when T2 must be identified. Experiment 3 demonstrated that both the size of the blink and sensitivity to T2 reflected the number of items competing for retrieval as T2; such competition, moreover, occurred at a conceptual or categorical level rather than at a purely visual one. The relationship between the interference and alternative models of the attentional blink is discussed.     

Issue Editors' Note

Theoretical Medicine and Bioethics -     

Curriculum-based measurement and literature-based reading: Is curriculum-based measurement meeting the needs of changing reading curricula?

This study examined the extent to which curriculum-based measurement (CBM) procedures could be implemented in a nonbasal reading curricula. Participants included 160 students from 31 second, third, fourth, and fifth grades, located in two school districts. Half of the students (20 from each grade) were instructed primarily in a literature-based reading series, while the remaining 80 participants (20 from each grade) were instructed primarily in a traditional skills-based reading program. CBM passage probes from each reading series were administered to all students twice weekly over an 8-week period. Students' rate of progress in each reading series was indexed using the slope of their data series' calculated by ordinary least squares regression. Results showed small yet significant main effects for the type of probe used for progress monitoring; however, this effect was not consistent across grades. In addition, significant main effects were found for grade. Students' growth in oral reading rate was found to increase linearly with grade until fifth grade where a leveling off in growth rate was observed. Results are discussed in relation to CBM as an applied measurement methodology for use in both practical and research applications.     

Constructions of Therapy, Race, Ethnicity, and Gender; An Anthropological Metaphor

This article develops an anthropological metaphor for conducting therapy with families of a racial and/or gender identification different from that of the therapist. This metaphor is grounded in constructionism. It is suggested that when gender and/or racial issues arise in the course of therapy, the therapist must avoid both adhering too stringently to cultural/racial stereotypes, as well as ignoring such stereotypes altogether. Committing either of these errors not only does a disservice to the family, but jeopardizes the therapy. It is also suggested that such issues must be dealt with openly in order to maximize the effectiveness of the interventions.     

PROMPTING PATRON SAFETY BELT USE AT A SUPERMARKET

We used a reversal (ABAB) design to assess the effects of a personal prompt on safety belt usage by grocery store patrons. A personal prompt delivered by grocery carriers resulted in a 12% increase in the number of patrons exiting the parking lot with their safety belts buckled. This simple, low-cost intervention offers potential savings to society from increased safety belt use.     

Phonological recoding and lexical access

Four experiments are reported that examine the effects of homophony (e.g., SAIL/SALE) on response latency in a lexical decision task. The results indicated that an effect of homophony was evident only if the nonword distractors consisted of legal, pronounceable strings (e.g., SLINT), but that this effect disappeared if the nonwords sounded like English words (e.g., BRANE). An optional encoding strategy is proposed to account for this differential effect. It is suggested that while both graphemic and phonemic encoding occurred simultaneously, naive subjects tended to rely on the outcome of the phonological route. However, when such reliance produced a high error rate (i.e., when the nonwords sounded like English words),. these subjects were able to abandon a phonological strategy and rely on the graphemic encoding procedure instead. Two further aspects of the results are of interest. First, the less frequent member of a homophone pair was slower when compared with a control item if the nonword distractors were of the SLINT type, but not different if they were of the BRANE type. The high-frequency members did not differ from their controls in either nonword environment. Second, in a homophone “repetition” experiment, the frequency order of presentation within pairs of homophones (i.e., the high-frequency member followed by the low-frequency member, or vice versa) had a substantial effect. A spelling recheck procedure and a response-inhibitory mechanism are postulated to incorporate these effects into a dual-encoding direct-access model of word recognition.     

A further study of stimulus generalization following three-stimulus discrimination training

A group of pigeons was trained in a Skinner box to peck for VI reinforcement when the key was illuminated by a monochromatic light of 540 or 580 mμ but were non-reinforced for responding to 560 mμ. Two control groups, differing in amount of training, received only the two positive stimuli. At the completion of training all Ss received generalization tests under extinction. Both control groups produced bi-modal generalization gradients with the peaks of responding at the S+ values. The post-discrimination gradient revealed peaks displaced from the S+ values in the direction away from the S−, low responding and increased steepness in the region of S− and a general elevation of the gradient.     

Responsibility and Alternative Possibilities: The Use and Abuse of Examples

The philosophical debate over the compatibility between causaldeterminism and moral responsibility relies heavily on ourreactions to examples. Although we believe that there is noalternative to this methodology in this area of philosophy, someexamples that feature prominently in the literature are positivelymisleading. In this vein, we criticize the use that incompatibilistsmake of the phenomenon of ``brainwashing,' as well as the Frankfurt-styleexamples favored by compatibilists. We provide an instance of thekind of thought experiment that is needed to genuinely test thehypothesis that moral accountability and causal determinism arecompatible.