Thin slices, or excerpts of behavior, are commonly used by researchers to represent behaviors in their full stimulus. The present study asked how slices of different lengths and locations, as well as different measurement methodologies, influence correlations between the measured behavior and different variables (predictive validity). We collected self-rated, perceiver-rated, and objectively measured data on 60 participants who participated in a 5-min interaction with a confederate on video. These videos were split into five 1-min slices and rated for verbal and nonverbal behaviors via global impressions, using the same rater for all five slices and also using a different rater for each slice. For single slices, results indicated no clear pattern for optimal slice locations. In general, single slices had weaker predictive validity than the total. Slices of 2 or 3 min were, in general, equal to 5-min total in predictive validity. The magnitude of correlations was similar when same versus different coders were used, and the predictive validity correlations of the two methods covaried strongly across behavior-outcome variable combinations.

研究人员通常使用薄片或行为摘录来代表其全部刺激行为。本研究询问不同长度和位置以及不同测量方法的切片如何影响被测行为与不同变量之间的相关性（预测有效性）。我们收集了60名与视频同盟者进行5分钟互动的参与者的自我评估，感知评估和客观衡量的数据。这些视频被分为五个1分钟的片段，并通过全局印象对所有五个片段使用相同的评分器，并对每个片段使用不同的评分器来评估其言语和非言语行为。对于单个切片，结果表明最佳切片位置没有清晰的图案。通常，单个切片的预测效度比整个切片弱。一般而言，2到3分钟的切片在预测有效性上总共等于5分钟。当使用相同的编码器与不同的编码器时，相关性的大小相似，并且这两种方法的预测效度相关性在行为结果变量组合之间存在很大的协变量。