The entry point of face recognition: Evidence for face expertise.

Previous studies have shown that experts (e.g., birdwatchers) are as fast to recognize objects at subordinate levels of abstraction (e.g., robin) as they are to recognize the same object at the basic level (e.g., bird). As a test of face expertise, the current study found that adults identify faces more frequently (Experiment 1) and as quickly (Experiment 2) at the subordinate level (e.g., Bill Clinton) as at the basic level (e.g., human). Whereas brief presentation (75 ms) impaired subordinate-level recognition of nonface objects, it did not impair the subordinate level recognition of faces (Experiment 3). Finally, in an identity-matching task, subordinate-level primes facilitated the matching responses of faces but not nonface objects (Experiment 4). Collectively, these results indicate that face expertise, like expert object expertise, promotes a downward shift in recognition to more subordinate levels of abstraction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Structural knowledge assessment: Comparison of referent structures.

Network representations of student knowledge are usually evaluated by comparing them to an expert "referent" structure. This study compared referent structures produced by the instructor, other experts, averaged experts, and an average based on the best students in the class. The referents were compared in their ability to predict exam performance in 2 college level computer programming courses and to differentiate among levels of expertise. Results showed that in terms of these criteria, (1) instructor-based referents were no better than other experts; (2) there was substantial variability among experts; and (3) structures derived from both averaged experts and averaged best students provided valid referents, but the expert-based referent was superior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dog versus collie: Vocabulary in speech to young children.

Adult speech to children was recorded during interactions between 2 nursery school teachers and their 2–4 yr old students and between mothers and their 18–30 mo old children. Nouns in 4 general categories were rated for taxonomic level: subordinate (e.g., collie), basic level (e.g., dog), or superordinate (e.g., animal). Basic level nouns were the most frequently used. A further study was conducted to determine whether heavy reliance on basic level vocabulary in speech to children represents a simplification strategy. 80 undergraduates wrote stories about sets of pictures as they would tell the stories to either a child or an adult listener. Ss produced significantly more basic level nouns than subordinate or superordinate nouns for child listeners only, suggesting the use of a simplification strategy. In addition, the proportion of all items labeled at the subordinate level that were also labeled at the basic level was significantly higher in stories for a child listener than in stories for an adult listener. Data suggest that speakers may tend to orient a child listener to the basic level of categorization even when using words at other taxonomic levels. (11 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Stimulus type, level of categorization, and spatial-frequencies utilization: Implications for perceptual categorization hierarchies.

The type of visual information needed for categorizing faces and nonface objects was investigated by manipulating spatial frequency scales available in the image during a category verification task addressing basic and subordinate levels. Spatial filtering had opposite effects on faces and airplanes that were modulated by categorization level. The absence of low frequencies impaired the categorization of faces similarly at both levels, whereas the absence of high frequencies was inconsequential throughout. In contrast, basic-level categorization of airplanes was equally impaired by the absence of either low or high frequencies, whereas at the subordinate level, the absence of high frequencies had more deleterious effects. These data suggest that categorization of faces either at the basic level or by race is based primarily on their global shape but also on the configuration of details. By contrast, basic-level categorization of objects is based on their global shape, whereas category-specific diagnostic details determine the information needed for their subordinate categorization. The authors conclude that the entry point in visual recognition is flexible and determined conjointly by the stimulus category and the level of categorization, which reflects the observer’s recognition goal. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Mechanisms and neural basis of object and pattern recognition: A study with chess experts.

Comparing experts with novices offers unique insights into the functioning of cognition, based on the maximization of individual differences. Here we used this expertise approach to disentangle the mechanisms and neural basis behind two processes that contribute to everyday expertise: object and pattern recognition. We compared chess experts and novices performing chess-related and -unrelated (visual) search tasks. As expected, the superiority of experts was limited to the chess-specific task, as there were no differences in a control task that used the same chess stimuli but did not require chess-specific recognition. The analysis of eye movements showed that experts immediately and exclusively focused on the relevant aspects in the chess task, whereas novices also examined irrelevant aspects. With random chess positions, when pattern knowledge could not be used to guide perception, experts nevertheless maintained an advantage. Experts' superior domain-specific parafoveal vision, a consequence of their knowledge about individual domain-specific symbols, enabled improved object recognition. Functional magnetic resonance imaging corroborated this differentiation between object and pattern recognition and showed that chess-specific object recognition was accompanied by bilateral activation of the occipitotemporal junction, whereas chess-specific pattern recognition was related to bilateral activations in the middle part of the collateral sulci. Using the expertise approach together with carefully chosen controls and multiple dependent measures, we identified object and pattern recognition as two essential cognitive processes in expert visual cognition, which may also help to explain the mechanisms of everyday perception. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Attending to the Execution of a Complex Sensorimotor Skill: Expertise Differences, Choking, and Slumps.

A simulated baseball batting task was used to compare the relative effects of attending to extraneous information (tone frequency) and attending to skill execution (direction of bat movement) on performance and swing kinematics and to evaluate how these effects differ as a function of expertise. The extraneous dual task degraded batting performance in novices but had no significant effect on experts. The skill-focused dual task increased batting errors and movement variability for experts but had no significant effect on novices. For expert batters, accuracy in the skill-focused dual task was inversely related to the current level of performance. Expert batters were significantly more accurate in the skill-focused dual task when placed under pressure. These findings indicate that the attentional focus varies substantially across and within performers with different levels of expertise. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Objects, parts, and categories.

Conducted 4 studies to show that the basic level differs qualitatively from other levels in taxonomies of objects and of living things. The 4 studies show that (1) parts prevail at the basic level, (2) basic level categories differ by parts, (3) subordinate level categories share parts, and (4) parts vary in perceived goodness. It was found that part terms proliferated in Ss' listings of attributes characterizing category members at the basic level, but were rarely listed at a general level. At a more specific level, fewer parts were listed, although more were judged to be true. Perceptual salience and functional significance both contributed to perceived part goodness. It is proposed that part configuration underlies the various empirical operations of perception, behavior, and communication that converge at the basic level. Part configuration underlies the perceptual measures because it determines the shapes of objects to a large degree. Parts underlie the behavioral tasks because most behavior is directed toward parts of objects. Labeling appears to follow the natural breaks of perception and behavior; consequently, part configuration also underlies communication measures. Because elements of more abstract taxonomies, such as scenes and events, can also be decomposed into parts, this analysis provides a bridge to organization in other domains of knowledge. (47 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Young writers' use of text structure in expository text generation.

Although few studies have examined children's use of text structure in writing, knowledge of text structure is presumed to be an important strategy underlying effective expository text generation. The purpose of this study was to examine the ability of writers at two ages and three ability levels in generating textually consistent superordinate main ideas and subordinate details for three types of text structures. Analyses revealed significant main effects for grade, ability, and text type. More proficient writers seemed to possess a more generalized knowledge of text structure that they applied at both the superordinate and subordinate levels, whereas less proficient writers seemed to perform best in writing subordinate details. The findings supported the conclusion that knowledge of text structure was developmentally acquired, and that text structures varied in their saliency to young writers, although the majority of writers at both grade levels remained largely insensitive to text structure in composition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A visual short-term memory advantage for objects of expertise.

Visual short-term memory (VSTM) is limited, especially for complex objects. Its capacity, however, is greater for faces than for other objects; this advantage may stem from the holistic nature of face processing. If the holistic processing explains this advantage, object expertise--which also relies on holistic processing--should endow experts with a VSTM advantage. The authors compared VSTM for cars among car experts and car novices. Car experts, but not car novices, demonstrated a VSTM advantage similar to that for faces; this advantage was orientation specific and was correlated with an individual's level of car expertise. Control experiments ruled out accounts based solely on verbal- or long-term memory representations. These findings suggest that the processing advantages afforded by visual expertise result in domain-specific increases in VSTM capacity, perhaps by allowing experts to maximize the use of an inherently limited VSTM system. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Learning of nondomain facts in high- and low-knowledge domains.

Research on expertise has repeatedly documented that experts learn new information better than do novices, but only when the information is relevant to the expert's domain. It was found in Experiment 1 that participants showed superior learning and recall of a large quantity of new, non-domain-relevant facts about concepts within their domain of high knowledge than about concepts for which they had low domain knowledge. Experiment 2 investigated whether the participants' superior recall of new facts related to concepts within their domain of high knowledge was due to the number of prior facts associated with the concept or to the prior frequency of repetition of those concepts. It was found that participants' recall of new facts was better for concepts with 5 prior associated facts than for concepts with a single prior association but that the number of previous repetitions of each concept did not affect the level of recall for the new facts. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Setters and samoyeds: the emergence of subordinate level categories as a basis for inductive inference in preschool-age children

Basic level categories are a rich source of inductive inference for children and adults. These 3 experiments examine how preschool-age children partition their inductively rich basic level categories to form subordinate level categories and whether these have inductive potential. Children were taught a novel property about an individual member of a familiar basic level category (e.g., a collie). Then, children's extensions of that property to other objects from the same subordinate (e.g., other collies), basic (e.g., other dogs), and superordinate (e.g., other animals) level categories were examined. The results suggest (a) that contrastive information promotes the emergence of subordinate categories as a basis of inductive inference and (b) that newly established subordinate categories can retain their inductive potential in subsequent reasoning over a week's time.     

The world of competitive Scrabble: Novice and expert differences in visuopatial and verbal abilities.

Competitive Scrabble players spend a mean of 4.5 hr a week memorizing words from the official Scrabble dictionary. When asked if they learn word meanings when studying word lists, only 6.4% replied "always," with the rest split between "sometimes" and "rarely or never." Number of years of play correlated positively with expertise ratings, suggesting that expertise develops with practice. To determine the effect of hours of practice (M = 1,904), the authors compared experts with high-achieving college students on a battery of cognitive tests. Despite reporting that they usually memorize word lists without learning meanings, experts defined more words correctly. Reaction times on a lexical decision task (controlling for age) correlated with expertise ratings, suggesting that experts develop faster access to word identification. Experts' superiority on visuospatial processing was found for reaction time on 1 of 3 visuospatial tests. In a study of memory for altered Scrabble boards, experts outperformed novices, with differences between high and low expertise on memory for boards with structure-deforming transformations. Expert Scrabble players showed superior performance on selected verbal and visuospatial tasks that correspond to abilities that are implicated in competitive play. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Practical intelligence at work: Relationship between aging and cognitive efficiency among managers in a bank environment.

A study was conducted to determine which better predicts performance among bank managers: tacit practical knowledge as assessed by the Tacit Knowledge Inventory for Managers (TKIM) or 2 psychometric measures of reasoning, the Raven's Advanced Progressive Matrices (Raven's) and the Verbal Reasoning subtest of the Differential Aptitude Test (DAT). Two hundred bank managers (43 experts and 157 nonexperts), ages 24–59 years old, participated. Increased age was associated with lower performance in Raven's and the DAT but less so in the TKIM; best performing older managers on average had high levels of tacit knowledge, although they scored lower on psychometric reasoning measures; TKIM predicted managerial skill; DAT and Raven's did not. These results suggest that stabilization of some aspects of intelligence may occur in old age. Implications of the findings for the study of practical intelligence, expertise, and compensatory abilities are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Development of behaviorally anchored rating scales as a function of organizational level.

2 levels in a large medical center-8 head nurses (supervisory level) and 9 registered nurses (subordinate level)-independently participated in the development of behaviorally anchored rating scales. Although the 2 organizational levels identified similar behavioral dimensions, the behavioral incidents defining the dimensions were valued differently. Alternative explanations for the obtained differences are offered, and a discussion of behavioral expectation scale methodology is presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Microgenetic analysis of first steps in children's acquisition of expertise on shorebirds.

A microgenetic analysis of the earliest steps in acquiring beginning levels of expertise on shorebirds was conducted. In Exp 1, 16 5-yr-old girls were given information about the names and attributes of 14 shorebirds during 4 sessions. Knowledge of names and attributes increased over time, and production of attributes surpassed production of names. Discrepancies between results from direct and indirect tests of attribute knowledge suggested a transitional period in the early development of expertise. Exp 2 involved a case analysis of a 4-yr-old boy who was an expert on other kinds of birds. Both experiments revealed the importance of individual characteristics to rate of expertise acquisition: children with higher levels of general intelligence and greater levels of domain-related knowledge acquire expertise faster. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Survey of expert opinion on intelligence and aptitude testing.

Psychologists and educational specialists with expertise in areas related to intelligence testing responded to a questionnaire dealing with a wide variety of issues constituting the IQ controversy. Overall, experts hold positive attitudes about the validity and usefulness of intelligence and aptitude tests. Tests are seen as adequately measuring most important elements of intelligence, although the tests are believed to be somewhat racially and socioeconomically biased. There is overwhelming support for a significant within-group heritability for IQ, and a majority of respondents feel that black-white and socioeconomic status IQ differences are also partially hereditary. Problems with intelligence tests are perceived in the influence of nonintellectual characteristics on test performance and in the frequent misinterpretation and overreliance on test scores in elementary and secondary schools. Despite these difficulties, experts favor the continued use of intelligence and aptitude tests at their present level. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Suppression of the degradation of adenine nucleotides during ischemia may not be a sufficient mechanism for infarct size limitation by preconditioning

OBJECTIVES: Exposure to pesticides in fruit growing was estimated by pesticide experts, occupational hygienists, and fruit growing experts to determine whether valid subjective assessments can be made by experts. The study objectives were (i) validation of exposure assessment by experts using different sources of information, (ii) assessment of interrater agreement, (iii) measurement of agreement between experts' assessments and actual quantitative exposure data. METHODS: Three groups with different expertise made four ratings. Three of the ratings were made in three phases in which exposure information was provided. RESULTS: The intraclass correlation was high for each subgroup of experts when tasks in fruit growing were relatively ranked by increasing exposure level. In general, the interrater agreement on factors influencing the internal dose decreased when more information on exposure was provided. Experts correctly considered dermal exposure as the prominent contributor to internal dose. Results were comparable for the three pesticides under study. The ranking of 15 specific sprayings with a fungicide clearly showed differences between raters according to their expertise. The pesticide experts and occupational hygienists were able to rank daily exposure levels during pesticide spraying in a meaningful way. CONCLUSIONS: Experts seem to recognize the most important determinants of external exposure and therefore should be able pay a role in evaluating the effectiveness of control measures taken to reduce external exposure and to determine exposure groups in epidemiologic studies. The expert panel should not be too small, and consensus or average estimates should be used because differences within expert groups can be considerable.     

Population of Linear Experts: Knowledge Partitioning and Function Learning.

Knowledge partitioning is a theoretical construct holding that knowledge is not always integrated and homogeneous but may be separated into independent parcels containing mutually contradictory information. Knowledge partitioning has been observed in research on expertise, categorization, and function learning. This article presents a theory of function learning (the population of linear experts model--POLE) that assumes people partition their knowledge whenever they are presented with a complex task. The authors show that POLE is a general model of function learning that accommodates both benchmark results and recent data on knowledge partitioning. POLE also makes the counterintuitive prediction that a person's distribution of responses to repeated test stimuli should be multimodal. The authors report 3 experiments that support this prediction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)