The nature and nurture of expertise: a fourth dimension

One formative idea behind the workshop on expertise in Berkeley in August of 2010 was to develop a viable “trading zone” of ideas, which is defined as a location “in which communities with a deep problem of communication manage to communicate” (Collins et al. 2010, p. 8). In the current case, the goal is to have a trading zone between philosophers, sociologists, and psychologists who communicate their ideas on expertise such that productive interdisciplinary collaboration results. In this paper, I review Harry Collins' three-dimensional model of expertise and provide a very brief and non-inclusive overview of a psychological response. In addition, I propose an addendum to the model by adding a fourth—natural talent—dimension.     

The core of expertise

I reply to my critics in respect of my work on expertise. I define the 'core' of the multidisciplinary 'expertise studies'. I argue that those who have taken the work seriously could resolve their problems by paying more attention to the core. Each could have made good use of an aspect of the core.     

Medical examiners and manner of death

An experimental study of medical examiners in Alberta, Canada, produced manner of death determinations from simulated cases (vignettes) in order to examine interexaminer variation in certification judgments. Characteristics of medical examiners such as experience, residence, and religious background were investigated. The influence of victim characteristics was also examined, including race, age, gender, marital status, cause of death, and the presence of alcohol. Experience, residence, and religion of examiner were found to be related to judgments as were gender, medical cause of death, and the presence of alcohol.     

The role of lexical expertise in reading homophones

In Experiment 1, university students classified on lexical expertise on the basis of spelling plus nonword pronunciation accuracy made lexical decisions to homophones and control words. Homophones were accepted as words more slowly than control words, but lexical experts showed a smaller homophone cost than the less skilled group. In Experiment 2, similarly classified groups showed a large difference in their ability to detect homophones, with the low-expertise group showing a yes bias to high-frequency words, and having difficulty detecting homophones when mate-frequency was low. The results suggest superior use of orthography in the lexical experts and more reliance on semantic information in nonexperts, and support the importance of facility with orthography–phonology mappings in lexical expertise.     

Facial comparison behaviour of forensic facial examiners

Facial examiners make visual comparisons of face images to establish the identities of persons in police investigations. This study utilised eye-tracking and an individual differences approach to investigate whether these experts exhibit specialist viewing behaviours during identification, by comparing facial examiners with forensic fingerprint analysts and untrained novices across three tasks. These comprised of face matching under unlimited (Experiment 1) and time-restricted viewing (Experiment 2), and with a feature-comparison protocol derived from examiner casework procedures (Experiment 3). Facial examiners exhibited individual differences in facial comparison accuracy and did not consistently outperform fingerprint analysts and novices. Their behaviour was also marked by similarities to the comparison groups in terms of how faces were viewed, as evidenced from eye movements, and how faces were perceived, based on the made feature judgements and identification decisions. These findings further understanding of how facial comparisons are performed and clarify the nature of examiner expertise.     

The nature of humor in human nature: Cross-cultural commonalities

It is contended that humor is a universal, pan-cultural phenomenon. Humor theory is examined on superiority, psychoanalytic, and incongruity-resolution dimensions. Cross-cultural humor commonalities are derived from the literature; and genetic, biological, and social dynamics of humor are explored. Intercultural differences in the content domain of humor are noted. It is concluded that humor is an appropriate intervention for ethnically diverse clients, when used sensitively in the counselling process.     

The relationship between visual attention and expertise in sports

ObjectivesGiven the prevalence of misperception and failed perception, particularly in attention-demanding team sports, surprisingly few studies have explored whether experts in team sports differ from other athletes and from non-athletes in their basic attention abilities.MethodIn this study, we examined group differences between experts in team handball (n = 40), athletes from non-team sports (n = 40), and novice athletes (n = 40) using a battery of three attention tasks: a functional field of view task, a multiple-object tracking task, and an inattentional blindness task.ResultsPerformance on the three attention tasks was largely independent, with no significant correlations among the tasks. Team sports experts showed no better performance on the basic attention tasks than did athletes from non-teams sports or novice athletes.ConclusionsThe finding that all basic attention tasks are largely independent provides preliminary support for the idea that attentional breadth, tracking performance, and inattentional blindness are distinct attentional processes. Our results demonstrate that sports expertise effects are unrelated to basic differences in attention—expertise does not appear to produce differences in basic attention and basic differences in attention do not appear to predict eventual expertise. Further experiments could focus on the ways in which more specific attentional strategies and processes contribute to sports performance.     

The experience machine and the expertise defense

Recent evidence suggests that participants without extensive training in philosophy (so-called lay people) have difficulties responding consistently when confronted with Robert Nozick’s Experience Machine thought experiment. For example, some of the participants who reject the experience machine for themselves would still advise a stranger to enter the machine permanently. This and similar findings have been interpreted as evidence for implicit biases that prevent lay people from making rational decisions about whether the experience machine is preferable to real life, which might have consequences for one of the strongest objections to philosophical hedonism (the view that pleasure is the only intrinsic value). Against this consequence, it has been argued that expert philosophers are immune to such biases (the so-called expertise defense). In this paper, I report empirical evidence against this expertise defense.     

The positive and negative of human expertise in gaze perception

Judging where others look is crucial for many social and cognitive functions. Past accounts of gaze perception emphasize geometrical cues from the seen eye. Human eyes have a unique morphology, with a large white surround (sclera) to the dark iris that may have evolved to enhance gaze processing. Here we show that the contrast polarity of seen eyes has a powerful influence on gaze perception. Adult observers are highly inaccurate in judging gaze direction for images of human eyes with negative contrast polarity (regardless of whether the surrounding face is positive or negative), even though negative images of eyes preserve the geometric properties of positives that are judged accurately. The detrimental effect of negative contrast polarity is much larger for gaze perception than for other directional judgements (e.g. judging which way a head is turned). These results suggest an 'expert' system for gaze perception, which always treats the darker region of a seen eye as the part that does the looking.     

The influence of expertise on X-ray image processing

Observers with four different levels of radiological experience performed a recognition memory task on slides of faces and chest X-ray films. Half of the X-ray films revealed clinically significant abnormalities and half did not. Recognition memory for faces was uniformly high across all levels of radiological experience. Memory for abnormal X-ray films increased with radiological experience and, for the most experienced radiologists, was equivalent to memory for faces. Surprisingly, recognition memory for normal films actually decreased with radiological experience from above chance to a chance level. These results indicate that radiological expertise is associated with selective processing of clinically relevant abnormalities in X-ray images. Expert radiologists appear to process X-ray images the way that we all process faces, by quickly detecting and devoting processing resources to features that distinguish one stimulus from another. However, the selective processing of X-ray films appears to be restricted to clinically relevant abnormalities. As they develop the ability to detect these abnormalities, radiologists appear to lose the ability to detect variations in normal features.     

Chess expertise in children

This paper reports several studies of chess expertise in children who play competitive chess. The first study examines (1) the relationship between experience and skill among 113 school-age children (grades 1 through 12); and (2) the relationship between chess skill and scores on various spatial and logical abilities tests among the top 15 players. Improvement in skill is related to experience, and chess players score higher than average on the Raven's Progressive Matrices. Also, scores on a chess-specific test, the Knight's Tour, correlate with scores on the Raven's. The second study reports three experiments with 59 Ss involving chess-specific tasks in memory, perception, and similarity judgements. The first two experiments replicated and extended Chase and Simon (1973). The third experiment, which asked Ss to judge similarities of chess positions, demonstrated that similarity judgements become more global and abstract with increased skill. The final section describes qualitatively how children's chess expertise compares to that of adults. Drawing upon Anderson (1985), we focus on some distinctive features of children's chess play and on some successful techniques in coaching young players.     

The training and transfer of real-world perceptual expertise

A hallmark of perceptual expertise is that experts classify objects at a more specific, subordinate level of abstraction than novices. To what extent does subordinate-level learning contribute to the transfer of perceptual expertise to novel exemplars and novel categories? In this study, participants learned to classify 10 varieties of wading birds and 10 varieties of owls at either the subordinate, species (e.g., "great blue crown heron,"eastern screech owl") or the family ("wading bird,"owl") level of abstraction. During training, the amount of visual exposure was equated such that participants received an equal number of learning trials for wading birds and owls. Pre- and posttraining performance was measured in a same/different discrimination task in which participants judged whether pairs of bird stimuli belonged to the same or different species. Participants trained in species-level discrimination demonstrated greater transfer to novel exemplars and novel species categories than participants trained in family-level discrimination. These findings suggest that perceptual categorization, not perceptual exposure per se, is important for the development and generalization of visual expertise.     

The effect of expertise on collaborative problem solving

Why do some groups succeed where others fail? We hypothesise that collaborative success is achieved when the relationship between the dyad's prior expertise and the complexity of the task creates a situation that affords constructive and interactive processes between group members. We call this state the zone of proximal facilitation in which the dyad's prior knowledge and experience enables them to benefit from both knowledge-based problem-solving processes (e.g., elaboration, explanation, and error correction) andcollaborative skills (e.g., creating common ground, maintaining joint attention to the task). To test this hypothesis we conducted an experiment in which participants with different levels of aviation expertise, experts (flight instructors), novices (student pilots), and non-pilots, read flight problem scenarios of varying complexity and had to identify the problem and generate a solution with either another participant of the same level of expertise or alone. The non-pilots showed collaborative inhibition on problem identification in which dyads performed worse than their predicted potential for both simple and complex scenarios, whereas the novices and experts did not. On solution generation the non-pilot and novice dyads performed at their predicted potential with no collaborative inhibition on either simple or complex scenarios. In contrast, expert dyads showed collaborative gains, withdyads performing above their predicted potential, but only for the complex scenarios. On simple scenarios the expert dyads showed collaborative inhibition and performed worse than their predicted potential. We discuss the implications of these results for theories of collaborative problem solving.     

The nature of curiosity in children

This study examined several behaviors claimed to reflect curiosity in order to determine whether there are one or more types of curiosity. A secondary purpose was to examine the relations between the one or more types of curiosity and sex, social class, intelligence, achievement level, and ratings of personality traits. In two individual sessions 84 American first-grade boys and girls were administered five tasks which measured observation of complex and simple stimuli, preference of complex and simple stimuli, preference for the unknown, structure of meaning, and object exploration. A normalized Varimax factor analysis allowed the extraction of five factors: manipulatory curiosity, perceptual curiosity, conceptual curiosity, curiosity about the complex, and adjustive-reactive curiosity. Only the first factor was related to a demographic variable, sex. The nature of the factors and their theoretical and practical significance are discussed.     

The nature of aspiration in psychotherapy

This paper underscores the importance of aspiration as an active, progressive striving toward goals. Aspiration is often borne out of new experiences with new objects that differ from the patient's archaic objects. Patients who take inventory of their aspirations start to understand how they consciously and unconsciously work toward or ward off the attainment of goals. Self-discrepancy approaches (e.g., Jacobson, 1964; Schafer, 1967; Blos, 1974; Higgins, 1987) emphasizing the gap between the patient's present self-experience and the ideal self are especially useful in understanding how aspiration is facilitated or stymied. Aspirations may signal shifts in self-esteem. The patient who risks wanting more or wanting to be more has begun to alter the static view of the self. Aspiration facilitates the patient's imaginative, visualizing capacities as he or she focuses on foreseeing future possibilities.     

Children and chess expertise: The role of calibration

Summary Three studies of calibration are reported. Calibration refers to the accuracy with which one can predict one's own performance. In the first study child chess players, non-chess playing parents, and statistics students were asked to predict chances of winning chess games against hypothetical opponents. These subjective probabilities were compared to the actual probabilities, based on the Elo rating system. Better players' predictions were better calibrated. Confidence and ratings are negatively correlated, indicating that with lower ratings, players are overconfident. Skilled child players' predictions were better calibrated than any of the adults'. In the second study subjects were asked to estimate chances of winning in conjunctive situations, e. g., winning all the rounds in a tournament. Again, better child players were more accurate in their predictions and more accurate than adults. In the third study, child players were asked to predict their chances of winning in a non-chess domain after hearing a hypothetical win/loss history. Higher-rated players' predictions were again better calibrated, even though the domain was outside their expertise. The motivational and cognitive implications of calibration are discussed.     

Detecting deception in a bluffing body: The role of expertise

Studies of deception detection traditionally have focused on verbal communication. Nevertheless, people commonly deceive others through nonverbal cues. Previous research has shown that intentions can be inferred from the ways in which people move their bodies. Furthermore, motor expertise within a given domain has been shown to increase visual sensitivity to other people’s movements within that domain. Does expertise also enhance deception detection from bodily movement? In two psychophysical studies, experienced basketball players and novices attempted to distinguish deceptive intentions (fake passes) and veridical intentions (true passes) from an observed individual’s actions. Whereas experts and novices performed similarly with postural cues, only experts could detect deception from kinematics alone. These results demonstrate a link between action expertise and the detection of nonverbal deception.