Alphabetic search: Comment on Klahr, Chase, and Lovelace (1983).

Response time (RT) curves were obtained from Ss who were instructed to search for following or preceding letters in the alphabet with respect to given stimulus letters. To describe the shape of these curves, D. Klahr et al (see record 1984-05777-001) proposed a search model. It was assumed that the alphabet was internally represented by a number of chunks of a few letters. Klahr et al assumed that serial searches occurred along 2 hierarchical levels: (1) a search for the correct chunk and (2) a search of the letters within the chunk. The Klahr et al model predicted an ascending sawtooth-shaped RT curve. However, according to the authors' analysis of the data, the RT curves did not show the expected sawtooth shapes. In order to find out whether the lack of empirical support for the model was an artifact of averaging the data, the experiment was replicated. It was found that individual RT curves did not show the shape characteristics that were predicted by the Klahr et al model either. The data supported the hypothesis that the access of letters was direct without any hierarchy, and that the retrieval of successive letters was determined by the variable associations between subsequent letters. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct and indirect social influence on children's legal judgments.

Attempted to replicate the recent indirect influence phenomenon (H. D. Saltzstein et al, see record 1966-07558-001) with children and to demonstrate that direct influence declines with age while indirect influence increases with age. 176 3rd-8th graders from 2 parochial schools were required to make prison-sentence judgments based on tape recordings of 2 specially prepared criminal cases. Experimental Ss made initial judgments about sentence length in Case 1, were informed of the judge's sentence of 11 yrs and 6 mo, and made final decisions about sentence length. Experimental Ss then made decisions about sentence length for Case 2, were informed of the judge's sentence of 11 yrs 6 mo, and made final decisions about sentence length. Controls also made initial and final judgments for both cases but were not apprised of the judge's decision in either. Change from the initial to final sentence in Case 1 was the direct influence measure, while change from the initial sentence in Case 1 and Case 2 was the indirect influence measure. Data analysis revealed that there was a significant decline in direct influence with grade but no difference in indirect influence. Further research contrasting tests of indirect influence where the S either does or does not anticipate encounters with an influence agent is suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Modeling alphabetic retrieval: Rejoinder to Klahr (1994).

In D. Klahr's (see record 1994-24197-001) reply to J. Scharroo et al (see record 1994-24216-001), he ignored the basic critique on the hierarchy in the Klahr et al (see record 1984-05777-001) model of alphabetic retrieval. In this rejoinder, the modeling of alphabetic retrieval and the shape of response time curves with respect to the strong and weak tests and the alphabetic position effect is discussed. From discussion of these 2 points, it should be clear why Klahr did not deal with the main objections raised in Scharroo et al: (1) Klahr et al's (1983) response time curves did not show the predicted sawtooth shape and (2) there was no reason to assume an additional level (Level 1) in modeling alphabetic retrieval. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Plausible models of alphabetic search: Reply to Scharroo, Leeuwenberg, Stalmeier, and Vos (1994).

D. Klahr et al (see record 1984-05777-001) proposed a model of the cognitive processes involved in alphabetic retrieval in terms of a 2-level hierarchy of forward-linked associations. J. Scharroo et al (see record 1994-24216-001) attempt to demonstrate that a simple associative model is more plausible, more parsimonious, and a better fit to the data than is the Klahr et al model. In this commentary the author argues that Scharroo et al misrepresent the way in which Klahr et al evaluated their model and that they fail to demonstrate the superiority of a simple associative model. In addition, it is suggested that a composite model that integrates the distinctive features of both models would advance understanding of the process of alphabetic retrieval. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Evidence against the computation of abstract letter identities in visual processing.

Conducted 2 studies conceptually similar to the study of D. Besner et al (see record 1985-05766-001) in which letter strings were reorganized into sets where the single letters that were different were phonologically similar (e.g., G vs C) or dissimilar (e.g., G vs K). Latencies for same–different decisions about mixed-case letter strings were faster when the different letters were phonologically dissimilar. Results suggested skilled readers access name codes of individual letters in making their speeded classifications. In the present studies with 16 undergraduates, phonological similarity was manipulated in either the 1st or 4th letter of a mixed-case 4-letter string. A similarity effect was found when the 1st letter was varied. Results are not consistent with the view that abstract letter identities are computed in the course of same–different decisions about simultaneously presented mixed-case displays. (French abstract) (12 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Strategical invariance in lexical access: The reappearance of the pseudohomophone effect.

Examined the relationship between the presence of homophones and the appearance of the pseudohomophone effect, using 26 undergraduates. Ss were exposed to 10 pseudohomonyms, 10 nonwords, and 20 homophonic words or 20 nonhomophonic words in the 1st trial and to 15 pseudohomophones, 15 nonwords, and 30 nonhomophonic words during the 2nd trial. Ss' reaction time (RT) to a lexical decision task was recorded. Ss exposed to homophonic words during the 1st trial showed greater RT for decisions on pseudohomophones (pseudohomophone effect). Results support the conclusion of I. Dennis et al (1985) that the presence of homophones encourages a strategy of lexical decision making that changes the use made of phonological evidence. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Speeded tests of implicit knowledge.

Three experiments tested the hypothesis that implicit and explicit tasks involve distinct modes of processing. Ss observed rule-ordered letter strings and were asked either to memorize the strings or to try to discover the underlying rules. In Exp 1, they then made well-formedness judgments of novel strings under long-deadline and short-deadline conditions. Rule-discovery Ss, but not memory Ss, were impaired by the short deadline. In Exp 2, all Ss made "similarity" judgments of the novel strings instead of the traditional "rule-based" judgments; there were now no differences between the rule-discovery and memory groups. In Exp 3, Ss explicitly instructed in the rules were significantly more impaired under short deadlines than were memory Ss. An analysis of decision times to individual strings for the rule-trained vs memory groups also showed qualitative differences consistent with the implicit–explicit distinction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Locus of presentation and the selective masking effect.

Obtained forward and backward masking functions for 4 adult Ss in a nonmetacontrast letter recognition paradigm for letters presented either foveally or 1.75. in the periphery with a patterned mask. Both forward and backward masking were greater for peripherally presented stimuli. Forward masking showed a greater sensitivity to locus of presentation than backward masking. Results are considered in relation to the "ends-first" processing strategy explanation of the selective masking effect proposed by P. M. Merikle, et al. (French summary) (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The roles of stimulus-response compatibility and mental rotation in mirror-image and left-right decisions.

Examined the relative roles of mental rotation and stimulus-response (SR) compatibility in mirror-image and left-right decisions. 15 Ss, aged 19–43 yrs, were shown rotated letters and asked to indicate whether the letters were normal or backward (mirror-image task). Ss were then asked whether a dot would be located to the left or right of each letter if the letter was upright (viewer-centered left-right task) or if the letter was both upright and normal (letter-centered left-right task). The functions relating reaction time (RT) to angular orientation were parallel across the 3 tasks, suggesting that SR compatibility played no role, and that the Ss mentally rotated the letters to the upright in each case. A marked increase in RT to backward letters in the letter-centered task suggested a 2nd rotation in depth to restore the letters to normal. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

If you are gender schematic, all members of the opposite sex look alike.

96 male and 96 female undergraduates classified on the basis of the Bem Sex-Role Inventory were asked to recall "who said what" after listening to a taped conversation either among 3 men and 3 women (the gender study) or among 3 Blacks and 3 Whites (the race study). Analysis of Ss' errors revealed that both sex-typed and cross-sex-typed Ss confused the members of the opposite sex with one another significantly more than androgynous or undifferentiated Ss did. In contrast, no individual differences related to sex typing emerged in the race study, which suggests that the greater gender schematicity of sex-typed individuals is specific to gender, as S. L. Bem's (see record 1981-25685-001) gender schema theory implies. The finding that cross-sex-typed Ss were significantly more gender schematic than anyone else and the apparent inconsistency of the data with the self-schema theory of H. Markus et al (see record 1982-23588-001) are discussed. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Subitizing and counting skills in 3-year-olds.

Investigated 2 quantification skills, subitizing and counting, in 32 3-yr-olds. Three set sizes were used—2, 3, and 4. Ss showed a strong predilection to count on the subitizing task. Few subitizing responses occurred when Ss were asked to count. An informational analysis indicated no clear-cut difference between subitizing and counting except when the upper limit of subitizing was taken to be 4, in which case counting was superior. Findings fail to support a developmental model of quantification proposed by D. Klahr and J. G. Wallace (see PA, Vol 57:2924). (3 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Probability effects on stimulus evaluation and response processes.

Investigated the effects of probability information on response preparation and stimulus evaluation. Eight Ss responded with 1 hand to the target letter H and with the other to the target letter S. The target letter was surrounded by noise letters that were either the same as or different from the target letter. In 2 conditions, the targets were preceded by a warning stimulus unrelated to the target letter. In 2 other conditions, a warning letter predicted that the same letter or the opposite letter would appear as the imperative stimulus with .80 probability. Correct reactions times (RTs) were faster and error rates were lower when imperative stimuli confirmed the predictions of the warning stimulus. Probability information affected (1) the preparation of motor responses during the foreperiod, (2) the development of expectancies for a particular target letter, and (3) a process sensitive to the identities of letter stimuli but not to their locations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An examination of some diagnostic strategies involving the Wechsler Intelligence Scales.

This report examines a number of diagnostic hypotheses of D. Rapaport et al (1968), including differences between specific Wechsler subtests and clinical presentation, the magnitude of such a difference necessary for clinical significance, and overall indices of performance variability. Ss included 422 psychiatric patients comprising 3 diagnostic groups (affectives, psychotics, and schizophrenics) plus 19 normal controls. All Ss had either a Wechsler Adult Intelligence Scale (WAIS) or WAIS—R protocol. Only 2 of the 12 Rapaport et al hypotheses showed significant effects, and only 1 of these effects was moderated by the magnitude of difference between scales. When these 2 decision rules are translated into applied terms, the increase in diagnostic efficacy is low. There was no evidence for the utility of the overall scatter indices. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

You can't not believe everything you read.

Can people comprehend assertions without believing them? Descartes (1644/1984) suggested that people can and should, whereas Spinoza (1677/1982) suggested that people should but cannot. Three experiments support the hypothesis that comprehension includes an initial belief in the information comprehended. Ss were exposed to false information about a criminal defendant (Exps 1 and 2) or a college student (Exp 3). Some Ss were exposed to this information while under load (Exps 1 and 2) or time pressure (Exp 3). Ss made judgments about the target (sentencing decisions or liking judgments). Both load and time pressure caused Ss to believe the false information and to use it in making consequential decisions about the target. In Spinozan terms, both manipulations prevented Ss from "unbelieving" the false information they automatically believed during comprehension. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Order of processing in visual perception.

Three experiments tested predictions derived from 3 cognitive scanning hypotheses proposing respectively a left-to-right, ends-first, and peripheral-foveal order of scanning. In Exps I and II configurations of letters and/or digits were presented to 11 Ss around a central fixation point, and the stimulus was followed by a 1-sec presentation of a patterned mask or a blank white field. Backward masking selectively impaired the identification of stimuli in foveal positions whether or not these stimuli occupied middle-of-row positions. In Exp III 4 Ss made a manual same-different response to the presence or absence of a critical letter presented 3Deg. to the left or right of fixation. Noise letters appeared on either side or both sides of the critical letter. Identification response times were faster when the critical letter appeared in the left-most position in left field arrays and the right-most position in right field arrays. Principal conclusions drawn from the 3 experiments were: (a) Alphanumeric stimuli are scanned from the peripheral visual field inward towards fixation. (b) Any left-to-right scanning occurs relatively late in iconic processing. (c) An ends-first scanning strategy is a particular case of a more general peripheral-foveal strategy. (French summary) (40 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Another look at sex stereotypes and social judgments: An analysis of the social perceiver's use of subjective probabilities.

Reexamined the findings of A. Locksley et al (see record 1981-28048-001) that Ss fall prey to the baserate fallacy when they make stereotype-related trait judgments and that Ss ignore their stereotypes when trait judgments are made in the presence of trait-related behavioral information. A replication of Study 2 by Locksley et al, using 99 undergraduates, was conducted to examine 2 issues: (a) the use of a normative criterion in comparison with Ss' judgments and (b) the level of analysis (group vs individual) of Ss' judgments. Results show no support for the baserate fallacy. When a Bayesian normative criterion was constructed for each S based on the S's own stereotype judgments and was compared with assertiveness judgments made in the presence of individuating information, there was no evidence that Ss ignored or underused their stereotypes as the baserate fallacy predicts. (35 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social combination models, persuasive arguments theory, social comparison theory, and choice shift.

Individuals and 5-person groups responded 3 successive times to 4 standard choice-dilemma items in the order of either individual–group–individual or individual–individual–individual; 288 male undergraduates served as Ss. Decisions were made for oneself, for a friend, and for a stranger (the hypothetical protagonist of the standard choice-dilemma instructions). Decisions for the stranger were more risky than decisions for a friend, and decisions for a friend were more risky than decisions for oneself. As predicted from persuasive arguments theory, the best fitting social combination model on the most risky item was risk-supported wins; the best fitting model on the most conservative item was conservative-supported wins; and the best fitting model on 2 less extreme items was majority wins. It is emphasized that social combination models and theories of group-interaction processes, such as persuasive arguments theory or social comparison theory, are complementary rather than rival explanations of collective decision making. (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive-experiential self-theory and subjective probability: Further evidence for two conceptual systems.

Three experiments (N?=?1,331) demonstrated that research findings on suspiciousness about coincidences (D. T. Miller et al, 1989) can be accounted for in terms of subjective probability, as predicted by cognitive-experiential self-theory (CEST) but in contrast with the norm theory (NT) account offered by Miller et al. Ss participated in a hypothetical (Exps 1 and 2) or real (Exp 3) lottery game in which they chose between 2 bowls offering equivalent probabilities of winning or losing but differing with respect to absolute numbers (e.g., 1 in 10 vs 10 in 100). Responses across 4 conditions (2 probability levels?×?2 outcome types) and across the 3 experiments supported predictions derived from CEST but not those derived from NT. Results are discussed in terms of 2 conceptual systems, rational and experiential, that operate by different rules of inference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of spatial attention in visual word processing.

Ss made lexical decisions on a target letter string presented above or below fixation. In Exps 1 and 2, target location was cued 100 msec in advance of target onset. Responses were faster on validly than on invalidly cued trials. In Exp 3, the target was sometimes accompanied by irrelevant stimuli on the other side of fixation; in such cases, responses were slowed (a spatial filtering effect). Both cuing and filtering effects on response time were additive with effects of word frequency and lexical status (words vs nonwords). These findings are difficult to reconcile with claims that spatial attention is less involved in processing familiar words than in unfamiliar words and nonwords. The results can be reconciled with a late-selection locus of spatial attention only with difficulty but are easily explained by early selection models. (PsycINFO Database Record (c) 2010 APA, all rights reserved)