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91.
Research shows that target race can influence the decision to shoot armed and unarmed Black and White males (e.g., Correll, Park, Judd, & Wittenbrink, 2002). To date, however, research has only examined category level effects by comparing average responses to Blacks and Whites. The current studies investigated whether target prototypicality influences the decision to shoot above and beyond the effect of race. Here, we replicated racial bias in shoot decisions and demonstrated that bias was moderated by target prototypicality. As target prototypicality increased, participants showed greater racial bias. Further, when targets were unprototypic, racial bias reversed (e.g., participants mistakenly shot more unarmed Whites than Blacks). Study 2 examined whether these effects were observed among police officers. Although police showed no racial bias on average, target prototypicality significantly influenced judgments. Across both studies, sensitivity to variability in Whites' prototypicality drove these effects, while variation in Black prototypicality did not affect participants' decisions. 相似文献
92.
Forces imparted by the fingers onto a baseball are the final, critical aspects for pitching, however these forces have not been quantified previously as no biomechanical technology was available. In this study, an instrumented baseball was developed for direct measurement of ball reaction force by individual fingers and used to provide fundamental information on the forces during a fastball pitch. A tri-axial force transducer with a cable having an easily-detachable connector were installed in an official baseball. Data were collected from 11 pitchers who placed the fingertip of their index, middle, ring, or thumb on the transducer, and threw four-seam fastballs to a target cage from a flat mound. For the index and middle fingers, resultant ball reaction force exhibited a bimodal pattern with initial and second peaks at 38–39 ms and 6–7 ms before ball release, and their amplitudes were around 97 N each. The ring finger and thumb produced single-peak forces of approximately 50 and 83 N, respectively. Shear forces for the index and middle fingers formed distinct peak at 4–5 ms before release, and the peaks summed to 102 N; a kinetic source for backspin on the ball. An additional experiment with submaximal pitching effort showed a linear relationship of peak forces with ball velocity. The peak ball reaction force for fastballs exceeded 80% of maximum finger strength measured, suggesting that strengthening of the distal muscles is important both for enhancing performance and for avoiding injuries. 相似文献
93.
The representation of predictive force control and internal forward models: evidence from lesion studies and brain imaging 总被引:3,自引:0,他引:3
J. Hermsdörfer D. A. Nowak A. Lee K. Rost D. Timmann M. Mühlau H. Boecker 《Cognitive processing》2005,6(1):48-58
Force control on the basis of prediction avoids time delays from sensory feedback during motor performance. Thus, self-produced loads arising from gravitational and inertial forces during object manipulation can be compensated for by simultaneous anticipatory changes in grip force. It has been suggested that internal forward models predict the consequences of our movements, so that grip force can be programmed in anticipation of movement-induced loads. The cerebellum has been proposed as the anatomical correlate of such internal models. Here, we present behavioural data from patients with cerebellar damage and data from brain imaging in healthy subjects further elucidating the role of the cerebellum in predictive force control. Patients with cerebellar damage exhibited clear deficits in the coupling between grip force and load. A positron-emission-tomography (PET) paradigm that separated the process of the grip force/load coupling from the isolated production of similar grip forces and loads was developed. Interaction and conjunction analyses revealed a strong activation peak in the ipsilateral posterior cerebellum particularly devoted to the predictive coupling between grip force and load. Both approaches clearly demonstrate that the cerebellum plays a major role in force prediction that cannot be compensated for by other sensorimotor structures in case of cerebellar disease. However, evidence suggests that also extra-cerebellar structures may significantly contribute to predictive force control: (1) grip force/load coupling may also be impaired after cerebral and peripheral sensorimotor lesions, (2) a coupling-related activation outside the cerebellum was observed in our PET study, and (3) the scaling of the grip force level and the dynamic grip force coupling are dissociable aspects of grip force control. 相似文献
94.
Prior research has consistently documented that the vast majority of sexual assault cases do not progress through the criminal justice system. However, there is less agreement in prior work on how race influences case progression, resulting in a literature frequently described as “inconsistent.” This systematic review examines all prior research that has included race as an independent variable in predicting the criminal justice system response to sexual assault (N = 34) in an effort to provide insight into seemingly disparate findings. We assess each study for the degree to which race was a focal point of interest, if and what theory was used to inform the investigation of race, how samples were drawn, and how and whose race was measured. Results illustrate that findings in prior research are not inconsistent, but rather unite to tell a nuanced story of the role of race in the criminal justice system response to sexual assault. The review demonstrates how decisions made by researchers throughout the research process can have significant impacts on reported findings, and how such findings may be used to influence policy and practice. 相似文献
95.
This article provides a “behind-the-scenes” account of how and why the Inwald/ Hilson tests were developed. Since the 1970s, personality testing has been adapted and customized for use in selecting applicants for different occupations, including police, public safety, fire and emergency services personnel. The author developed the Inwald Personality Inventory (IPI) in 1979 as the first comprehensive behaviorally-based personality measure designed and validated specifically for use in high risk occupations, such as law enforcement. Over time, studies consistently demonstrated that the IPI was a better predictor of poor job performance than were traditional tests of psychopathology. While antisocial behavior patterns and characteristics measured by the IPI predicted poor job performance, there also developed a need for measures that would predict above-average/excellent performance in the workplace. In 1988, the author designed and validated the first comprehensive test of “positive” work-related characteristics or “emotional IQ,” the Hilson Personnel Profile/Success Quotient (HPP/SQ). Other instruments followed, including the Inwald Survey 5 — Revised (IS5-R) with questions added on domestic violence. This article describes the theoretical rationale, development and validation of several instruments developed by the author and now widely used for high risk occupations and for screening corporate managers and key personnel in occupational settings. 相似文献
96.
97.
从事件因素和时间因素两个方面探讨了准备状态对反应抑制的影响。事件准备可降低反应模式的不确定性 ,而时间准备则与降低反应时间的不确定性有关。线索、反应概率以及刺激呈现时间等因素不仅导致反应时间出现变化 ,还可引起反应力、心跳间期以及LRP和CNV等脑电指标发生变化。传统的反应抑制研究以反应时为指标 ,不能揭示反应抑制的内部过程 ,而心理生理学方法能弥补这一缺陷。生理指标与行为指标的结合 ,以及生理指标之间的结合 ,可更有效地探讨准备状态对反应抑制的效应。 相似文献
98.
van Domburgh L Vermeiren R Blokland AA Doreleijers TA 《Journal of abnormal child psychology》2009,37(1):93-105
Heterogeneity of re-offending patterns was studied in a group of 287 male early onset offenders who were first arrested before
age 12. By combining data on the frequency and severity of offending as registered by the police over a 5-year follow-up period,
three delinquent trajectories were identified; low, escalating, and high level re-offenders. Predicting group membership by
individual and environmental characteristics known to the police at the time of the first arrest proved difficult. Compared
to low level re-offenders, escalators were older and more often came from disadvantaged neighborhoods. High level re-offenders
were also older at onset, more often had a non-Western ethnic background, and initially committed more vandalism. Furthermore,
at the first police encounter, the police reacted more severely towards those who later became high level re-offenders. Finally,
high and escalating re-offenders more often had other adverse outcomes, such as criminal victimization and Child Welfare Agency
involvement.
相似文献
L. van DomburghEmail: |
99.
100.
Independence of response force and reinforcement rate on concurrent variable-interval schedule performance 总被引:7,自引:7,他引:0 下载免费PDF全文
Five pigeons were trained over 43 experimental conditions on a variety of concurrent variable-interval schedules on which the forces required on the response keys were varied. The results were well described by the generalized matching law with log reinforcement ratios and log force ratios exerting independent (noninteractive) effects on preference. A further analysis using the Akaike criterion, an information-theoretic measure of the efficiency of a model, showed that overall reinforcement rate and overall force requirement did not affect preference. Unlike reinforcement rate changes, force requirement increases did not change the response rate on the alternate key, and an extension of Herrnstein's absolute response rate function for force variation on a single variable-interval schedule is suggested. 相似文献