Using segmentation to support the learning from animated soccer scenes: An effect of prior knowledge

ObjectivesWe used a cognitive load perspective to investigate the effects of levels of learner expertise and different forms of segmentation in learning from animated soccer scenes.MethodExpert and novice players (N = 48) completed a recall reconstruction-test and rated their invested mental effort after studying a continuous animation, a macro-step and a micro-step segmented animation.ResultsFindings demonstrated an expertise reversal effect for segmentation. It positively affected learning outcomes of novices but not experts (even though they still invested less mental effort and repeated the animation less often in the two segmented conditions). Additionally, novices benefited more from micro-step segmentation than from macro-step segmentation, while experts performed at the same level with both forms of segmentation.ConclusionsStudy results suggested that adapting instructional animation formats to players with different levels of expertise should be a crucial part of successful training.     

Classical pattern recall tests and the prospective nature of expert performance

It is well established that experts are particularly adept at recalling and/or recognizing the key features of domain-relevant patterns. We compared the recall performance of expert and novice basketball players when viewing static and moving patterns. A novel method of analysis was used where the accuracy of the participants in recalling player positions was compared to actual player positions both at the final frame of pattern presentation and at 50 successive 40 ms increments thereafter. Experts encoded the locations of the players in both the static and moving patterns significantly further in advance of their actual finishing point than did nonexperts. Experts' use of an anticipatory encoding process, which was of a magnitude unmatched by nonexperts, suggests that many previous investigations may have underestimated the extent of the expert advantage in pattern recall.     

Classical pattern recall tests and the prospective nature of expert performance

It is well established that experts are particularly adept at recalling and/or recognizing the key features of domain-relevant patterns. We compared the recall performance of expert and novice basketball players when viewing static and moving patterns. A novel method of analysis was used where the accuracy of the participants in recalling player positions was compared to actual player positions both at the final frame of pattern presentation and at 50 successive 40 ms increments thereafter. Experts encoded the locations of the players in both the static and moving patterns significantly further in advance of their actual finishing point than did nonexperts. Experts' use of an anticipatory encoding process, which was of a magnitude unmatched by nonexperts, suggests that many previous investigations may have underestimated the extent of the expert advantage in pattern recall.     

Identification of Interindividual and Intraindividual Movement Patterns in Handball Players of Varying Expertise Levels

The authors examined the movement patterns of 5 left-handed handball players (ranging from beginner to national level) who threw a handball to different sections of a goal as if a goalkeeper were present. The authors used time-continuous, 3-dimensional kinematic data to assess interindividual movement patterns and considered participants' intraindividual differences relative to different targets. Cluster analysis yielded the highest assignment rates for level of expertise; a mean of 92% of trials was correctly assessed. The authors observed an interaction with expertise for the intraindividual movement patterns. Variability in the novice throwers was increased, whereas (a) advanced throwers experienced a period of stability, and (b) the expert thrower's variability was increased. The results indicate that random variability characterizes novice motor performance, whereas active functional variability may exemplify expert motor performance.     

Identification of interindividual and intraindividual movement patterns in handball players of varying expertise levels

The authors examined the movement patterns of 5 left-handed handball players (ranging from beginner to national level) who threw a handball to different sections of a goal as if a goalkeeper were present. The authors used time-continuous, 3-dimensional kinematic data to assess interindividual movement patterns and considered participants' intraindividual differences relative to different targets. Cluster analysis yielded the highest assignment rates for level of expertise; a mean of 92% of trials was correctly assessed. The authors observed an interaction with expertise for the intraindividual movement patterns. Variability in the novice throwers was increased, whereas (a) advanced throwers experienced a period of stability, and (b) the expert thrower's variability was increased. The results indicate that random variability characterizes novice motor performance, whereas active functional variability may exemplify expert motor performance.     

Diagnostic thinking processes: evidence from a constructive interaction study of electrocardiogram (ECG) interpretation

This paper examines the use of different types of knowledge at different levels of expertise in the domain of electrocardiogram (ECG) interpretation. Analyses of constructive interaction protocols from expert, novice and intermediate subjects working in same-skill pairs on six ECG traces indicated that: novice and intermediate pairs produced proportionately more trace characterizing statements than the other groups; expert pairs produced proportionately more clinical hypothesis statements and proportionately fewer but more complex biomedical inference statements than the other groups. © 1997 John Wiley & Sons, Ltd.     

The Effect of Disguise on Novice and Expert Tennis Players’ Anticipation Ability

Skilled performers interpret cues in the preparatory movements of their opponents to anticipate future events in many sports. Little work has tested whether these cues can be disguised. Using a temporal occlusion paradigm, this paper examines the effect of disguise on an Australian sample of expert (16 male, 2 female, age M = 24.67, SD = 9.47 years) and novice players’ (24 male, 38 female, age M = 22.26, SD = 5.24 years) anticipation of tennis ground strokes. Analysis of variance (ANOVA) showed that expert anticipation was more accurate than novice overall (p < .001), and disguise reduced accuracy (p = .001). The disguise effect differed by expertise across occlusion points (p = .027). The experts’ anticipatory advantage was removed by disguise at 40 ms before contact. Novice performance was significantly below chance for disguise shots occluded at contact. These results indicate that disguise is an important topic for research and practice.     

The role of attack and defense semantics in skilled players’ memory for chess positions

There is much evidence that chess skill is based on chunks in memory that represent parts of positions from previously encountered games. However, the content of these chunks is a matter for debate. According to one view, (1) the closer two pieces are to each other on a board (proximity), the more likely they are to be in the same chunk, and (2) skilled players encode the precise locations of pieces. An alternative view is that what information is encoded in a chess chunk is determined more by processing of the attack/defense relations during evaluation. In three experiments, participants evaluated positions and completed recognition tests. Experiment 1 supported the view that expert players make more use of attack/defense relations than of locations of pieces in a recognition test. Experiments 2 and 3 demonstrated that, for both long and short presentation times, expert players' recognition for a piece within a position was primed more by a piece related by attack or defense than by a piece merely proximal. These findings challenge theories of expertise for chess that assume a primary role for proximity and location in determining which pieces are grouped together in memory.     

Haste does not always make waste: Expertise,direction of attention,and speed versus accuracy in performing sensorimotor skills

In two experiments, we examined the attentional mechanisms governing sensorimotor skill execution across levels of expertise. In Experiment 1, novice and expert golfers took a series of putts under dual-task conditions designed to distract attention from putting and under skill-focused conditions that prompted attention to step-by-stePperformance. Novices performed better under skill-focused than under dual-task conditions. Experts showed the opposite pattern. In Experiment 2, novice and expert golfers putted under instructions that emphasized either putting accuracy or speed—the latter intended to reduce the time available to monitor and explicitly adjust execution parameters. Novices putted better under accuracy instructions. Experts were more accurate under speed instructions. In agreement with theories of skill acquisition and automaticity, novice performance is enhanced by conditions that allow for on-line attentional monitoring (e.g., skill-focused or accuracy instructions) in comparison with conditions that prevent explicit attentional control of skill execution (e.g., dual-task or speed constraints). In contrast, the proceduralized skill of experts benefits from environments that limit, rather than encourage, attention to execution.     

Example‐based learning: Effects of model expertise in relation to student expertise

Background. Worked examples are very effective for novice learners. They typically present a written‐out ideal (didactical) solution for learners to study. Aims. This study used worked examples of patient history taking in physiotherapy that presented a non‐didactical solution (i.e., based on actual performance). The effects of model expertise (i.e., worked example based on advanced, third‐year student model or expert physiotherapist model) in relation to students' expertise (i.e., first‐ or second‐year) were investigated. Sample. One hundred and thirty‐four physiotherapy students (61 first‐year and 73 second‐year). Methods. Design was 2×2 factorial with factors ‘Student Expertise’ (first‐year vs. second‐year) and ‘Model Expertise’ (expert vs. advanced student). Within expertise levels, students were randomly assigned to the Expert Example or the Advanced Student Example condition. All students studied two examples (content depending on their assigned condition) and then completed a retention and test task. They rated their invested mental effort after each example and test task. Results. Second‐year students invested less mental effort in studying the examples, and in performing the retention and transfer tasks than first‐year students. They also performed better on the retention test, but not on the transfer test. In contrast to our hypothesis, there was no interaction between student expertise and model expertise: all students who had studied the Expert examples performed better on the transfer test than students who had studied Advanced Student Examples. Conclusions. This study suggests that when worked examples are based on actual performance, rather than an ideal procedure, expert models are to be preferred over advanced student models.     

Perceptual Expertise as a Shift from Strategic Interference to Automatic Holistic Processing

Holistic processing was initially characterized a unique hallmark of face perception (e.g., Young et al., 1987) and later argued a domain-general marker of perceptual expertise (e.g., Gauthier et al., 1998). More recently, evidence for holistic processing - measured by interference from task-irrelevant parts - was obtained in novices, raising questions for its usefulness as a test of expertise. Indeed, recent studies use the same task to make opposite claims: Hsiao & Cottrell (2009) found more interference in novices than experts for Chinese characters, while Wong, Palmeri & Gauthier (2009) found more interference in experts than novices with objects. Offering a resolution to this paradox, our work on the perception of musical notation (Wong & Gauthier, in press) suggests that expert and novice interference effects represent two ends of a continuum: interference is initially strategic and contextual, but becomes more automatic as holistic processing develops with the acquisition of perceptual expertise.     

Anticipation skill and susceptibility to deceptive movement

The ability to detect deceptive movement was examined in skilled and novice rugby players. Participants (14 per group) attempted to predict direction change from video of expert and recreational rugby players changing direction with and without deceptive movement. Confidence associated with judgments was recorded on each trial to seek evidence regarding use of inferential (heuristic-based) and direct-perceptual (invariant-based) judgments. Novices were found to be susceptible to deceptive movement whereas skilled participants were not; however, both skilled and novice participants were more confident on trials containing deceptive movement. The data suggest that the skill-level difference in sensitivity to advance visual information extends to deceptive information. The implications of this finding, and the importance of considering the underlying process of anticipation skill, are discussed.     

Effect of expertise acquisition on strategic perception: the example of chess

The two experiments presented here study perceptual processes implemented by chess players in situations related to their domain of expertise. The aim was to determine how patterns are perceived as a function of their strategic value when players acquire expertise. In this study, conducted on novice and more experienced players, it is hypothesized that with acquisition of expertise players would quickly encode familiar patterns and then rapidly focus their attention on patterns with a higher immediate strategic value. In Experiment 1, participants had to carry out a change-detection task that used the "flicker paradigm". The results showed that during the perception of standard chess positions, experienced players--but not novices--quickly focused their attention on the most strategic patterns. In Experiment 2, experienced players and novices carried out a recognition task after having encoded chess positions for 1 or 5 s. The results indicated early encoding of familiar patterns without immediate strategic value, followed by the encoding of more strategic patterns. Taken together, the results of these two experiments are consistent with the results by both de Groot and Gobet (1996) and McGregor and Howes (2002) about the strategic content of Chase and Simon's chunks (Chase & Simon, 1973b).     

Skill in expert dogs

The motor control of novice participants is often cognitively demanding and susceptible to interference by other tasks. As people develop expertise, their motor control becomes less susceptible to interference from other tasks. Researchers propose a transition in human motor skill from active control to automaticity. This progression may also be the case with nonhuman animals. Differences in performance characteristics between expert, advanced, intermediate, and novice dogs competing in the sport of agility were investigated. There were statistically significant differences between dogs of varying competitive levels in speed, motor control, and signal detections suggestive of increasing motor control automaticity in highly skilled, or expert, dogs. The largest sequential motor control difference was between novice and intermediate dogs, d = .96, whereas the largest sequential signal detection difference was between advanced and expert dogs, d = .90. These findings have two significant implications for expertise researchers: first, the observed similarities between dogs and humans may enable dogs to be used as expert models; and second, expertise science and methods may be profitably employed in the future to create more proficient canine workers.     

The expert advantage in dynamic pattern recall persists across both attended and unattended display elements

We examined how differences in attention influence how expert and novice basketball players encode into memory the specific structural information contained within patterns of play from their sport. Our participants were primed during a typical recall task to focus attention on either attacking or defending player formations before being asked to recall the attended or unattended portion of the pattern. Adherence to the instructional set was confirmed through an analysis of gaze distributions. Recall performance was superior for the experts relative to the novices across both the attended and unattended attacking and defensive pattern structures. Expert recall of attacker positions was unchanged with and without attention, whereas recall accuracy for the positions of defenders diminished without attention, as did the novices’ recall of both attack and defense formations. The findings suggest that experienced performers are better than novices at encoding the elements from a complex and dynamic pattern in the absence of focused attention, with this advantage being especially evident in relation to the recall of attacking structure. Some revision of long-term memory theories of expertise will be necessary to accommodate these findings.     

The use of anticipatory visual cues by highly skilled tennis players

The authors examined 13 skilled and 12 novice tennis performers' ability to use visual information of an opponent's movement pattern to anticipate and respond. In Experiment 1, skilled and novice players anticipated the type of stroke and the direction in which the ball was hit in a highly coupled perception-action environment. Both groups of players correctly anticipated at greater than chance levels. Skilled players were significantly more accurate than novices with live and video displays but not with point-light displays. In Experiment 2, the reaction latencies of 10 expert performers were significantly faster when they returned balls hit by a live opponent than when they returned balls projected from a cloaked ball machine. The findings indicate that experts are able to use movement-pattern information to determine shot selection and to use that information to significantly reduce their response delay times. The findings are discussed in terms of perception-action coupling in time-stress activities.     

Influence of contextual information on observers' perceptions of actors' intentions to harm others

Previous examinations of perceptions of aggressive behaviors have used static stimulus presentations (e.g., photographs or slides). This investigation examined the impact of varying amounts of geographical and temporal contextual information on observers' perceptions of actors' intentions to physically and psychologically (intimidate) harm others. Participants (51 elite ice hockey players) were randomly assigned to view one of three video-taped presentations showing eight ice hockey behaviors in either a) a dynamic mode with contextual information, b) a dynamic mode with no context, or c) a static, “freeze-frame” mode. MANOVA results showed that non-aggressive stimuli were perceived as less aggressive, and aggressive stimuli were perceived as more aggressive in dynamic presentations with context than in static presentations. Based on these findings, it is suggested that future research focussing on perceptions of aggressive behavior utilize a dynamic stimulus presentation containing context material. © 1996 Wiley-Liss, Inc.     

Characterising expert representations during real-time action: A Skill Theory application to soccer

In various domains, experts are found to possess elaborate domain-specific representations they developed over years. In this study, we provide the first systematic attempt to characterise the short-term representations among individuals with different expertise levels. We showed videos of soccer game plays to expert, near-expert and non-expert soccer players and asked them to describe the actions taking place. Verbalisations were coded based on Fischer's Skill Theory. Monte Carlo permutation tests revealed that players with higher expertise constructed representations of higher complexity (regardless of their specific content). Taking the content of the representations into account, we found that higher expertise soccer players relatively more often included high complexity levels of actions not including the ball and (moving) players on the field. These findings improve our understanding of perceptual-cognitive expertise by demonstrating how actors with different levels of expertise integrate the information they perceive to construct their representations in real time.     

The coupling between gaze behavior and opponent kinematics during anticipation of badminton shots

PurposeWe examined links between the kinematics of an opponent’s actions and the visual search behaviors of badminton players responding to those actions.MethodA kinematic analysis of international standard badminton players (n = 4) was undertaken as they completed a range of serves. Video of these players serving was used to create a life-size temporal occlusion test to measure anticipation responses. Expert (n = 8) and novice (n = 8) badminton players anticipated serve location while wearing an eye movement registration system.ResultsDuring the execution phase of the opponent’s movement, the kinematic analysis showed between-shot differences in distance traveled and peak acceleration at the shoulder, elbow, wrist and racket. Experts were more accurate at responding to the serves compared to novice players. Expert players fixated on the kinematic locations that were most discriminating between serve types more frequently and for a longer duration compared to novice players. Moreover, players were generally more accurate at responding to serves when they fixated vision upon the discriminating arm and racket kinematics.ConclusionsFindings extend previous literature by providing empirical evidence that expert athletes’ visual search behaviors and anticipatory responses are inextricably linked to the opponent action being observed.