1.1本指南涵盖了对产品或其他感官刺激进行和分析时间强度（T-I）评估的程序。时间强度是测量单个感官在一段时间内对产品或其他感官刺激的单次暴露的反应强度。 1.2本指南使用经过专门培训的面板来测量从初始接触到的时间内单个连续感觉的强度: 1.2.1至其消亡， 1.2.2达到规定强度，或 1.2.3达到预定的时间限制。 1.3本指南未涵盖的应用包括测量: 1.3.1多种感觉， 1.3.2一次测量中的多次暴露，以及 1.3.3感知感觉的定性或享乐性变化。 1.4本指南包括法官的选择和培训协议、物理数据采集设备的描述和使用以及数据处理、汇总和统计分析方法。 附录中包含了两种不同数据处理和分析方法的说明。 1.5本指南不适用于测量需要在离散时间间隔进行评估的产品保质期或稳定性。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 时间强度测量的目的是建立研究中特定感觉特征的发展和衰退模式。当单个时间点（平均过程）的测量不足以区分具有非常不同时间特征的产品时，T-I评估适用。正如李和庞本所指出的那样 (1) 3. , “ 该平均过程导致重要信息的掩盖或完全丢失，例如刺激的开始速度、最大强度的时间和持续时间、感知强度的衰减速度、熄灭时间和整个过程的总持续时间。 ” 使用传统单点产品分析技术对产品进行类似评级的产品可能会为消费者提供非常不同的时间感官体验。产品的可接受性可能会受到影响，传统的描述方法无法反映属性强度随时间的变化。 T-I适用于各种产品。例如:食品，从饮料中的短期甜味到口香糖中的长期弹性；个人护理产品，测量洗发水泡沫的发展和寿命以及护肤霜的残留皮肤感觉；家用护理产品，随时间监测气味强度； 药物，监测局部止痛药使用后的皮肤冷却。产品中的听觉信号或视觉变化也可以通过T-I技术进行评估。

1.1 This guide covers procedures for conducting and analyzing time-intensity (T-I) evaluations of products or other sensory stimuli. Time-intensity is the measurement of the intensity of a single sensory sensation over time in response to a single exposure to a product or other sensory stimulus. 1.2 This guide utilizes a specially trained panel to measure the intensity of a single continuous sensation during the time from initial exposure: 1.2.1 To its extinction, 1.2.2 To a specified intensity, or 1.2.3 To a predetermined limit of time. 1.3 Applications not covered in this guide include measuring: 1.3.1 Multiple sensations, 1.3.2 Multiple exposures within a single measurement, and 1.3.3 Qualitative or hedonic changes in the perceived sensation. 1.4 This guide includes protocols for the selection and training of judges, descriptions and use of physical data collection devices, and methods of data handling, summarization, and statistical analysis. Illustration of two different data handling and analysis approaches are included in the appendixes. 1.5 This guide is not applicable to measure product shelf life or stability that require evaluations at discrete time intervals. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== The purpose of time-intensity measurements is to establish the pattern of development and decline of a particular sensory characteristic under study. T-I evaluations are applicable when measurements at a single time point (an averaging process) are not sufficient to distinguish products that have very different temporal characteristics. As pointed out by Lee and Pangborn (1) 3 , “ This averaging process results in the masking or complete loss of important information such as rate of onset of stimulation, time and duration of maximum intensity, rate of decay of perceived intensity, time of extinction, and total duration of the entire process. ” Products rated similarly using traditional single point techniques of product profiling may provide very different temporal sensory experiences to the consumer. Acceptability of the product may be affected, and traditional descriptive methodology does not reflect the changes in an attribute’intensity over time. T-I has applications for a variety of products. Examples include: food products, ranging from short-term sweetness in a beverage to long-term elasticity in chewing gum; personal care products, measuring the development and longevity of shampoo lather and the residual skin feel of a skin cream; household care products, monitoring the intensity of scents over time; pharmaceuticals, monitoring skin cooling after application of a topical analgesic. Auditory signals or visual changes in products can also be evaluated by the T-I technique.