Johnson Caleb D, LaGoy Alice D, Pepping Gert-Jan, Eagle Shawn R, Beethe Anne Z, Bower Joanne L, Alfano Candice A, Simpson Richard J, Connaboy Christopher
Aerosp Med Hum Perform. 2019 Dec 1;90(12):1000-1008. doi: 10.3357/AMHP.5376.2019.
Designed as a more ecological measure of reaction times, the Perception-Action Coupling Task (PACT) has shown good reliability and within-subject stability. However, a lengthy testing period was required. Perceptual-motor judgments are known to be affected by proximity of the stimulus to the action boundary. The current study sought to determine the effects of action boundary proximity on PACT performance, and whether redundant levels of stimuli, eliciting similar responses, can be eliminated to shorten the PACT. There were 9 men and 7 women who completed 4 testing sessions, consisting of 3 familiarization cycles and 6 testing cycles of the PACT. For the PACT, subjects made judgments on whether a series of balls presented on a tablet afford "posting" (can fit) through a series of apertures. There were 8 ratios of ball to aperture size (B-AR) presented, ranging from 0.2 to 1.8, with each ratio appearing 12 times (12 trials) per cycle. Reaction times and judgment accuracy were calculated, and averaged across all B-ARs. Ratios and individual trials within each B-AR were systematically eliminated. Variables were re-averaged, and intraclass correlation coefficients (ICC) and coefficients of variation (CV) were calculated in an iterative manner. With elimination of the 0.2 and 1.8 B-ARs, the PACT showed good reliability (ICC = 0.81-0.99) and consistent within-subject stability (CV = 2.2-14.7%). Reliability (ICC = 0.81-0.97) and stability (CV = 2.6-15.6%) were unaffected with elimination of up to 8 trials from each B-AR. The shortened PACT resulted in an almost 50% reduction in total familiarization/testing time required, significantly increasing usability.
感知 - 行动耦合任务（PACT）被设计为一种更符合生态学的反应时间测量方法，已显示出良好的可靠性和受试者内稳定性。然而，它需要较长的测试期。已知感知运动判断会受到刺激与动作边界接近程度的影响。当前研究旨在确定动作边界接近度对PACT表现的影响，以及是否可以消除引发相似反应的冗余刺激水平以缩短PACT。有9名男性和7名女性完成了4个测试环节，包括3个熟悉周期和6个PACT测试周期。对于PACT，受试者要判断平板电脑上呈现的一系列球是否能“穿过”一系列孔口（即是否能适配）。呈现了8种球与孔口尺寸的比例（B - AR），范围从0.2到1.8，每个比例在每个周期出现12次（12次试验）。计算反应时间和判断准确性，并对所有B - AR进行平均。系统地消除每个B - AR内的比例和单个试验。重新对变量进行平均，并以迭代方式计算组内相关系数（ICC）和变异系数（CV）。消除0.2和1.8的B - AR后，PACT显示出良好的可靠性（ICC = 0.81 - 0.99）和一致的受试者内稳定性（CV = 2.2 - 14.7%）。从每个B - AR中消除多达8次试验时，可靠性（ICC = 0.81 - 0.97）和稳定性（CV = 2.6 - 15.6%）不受影响。缩短后的PACT使所需的总熟悉/测试时间减少了近50%，显著提高了可用性。
