120 JOURNAL OF COSMETIC SCIENCE i i i T --•-- Petroleum jelly - self-applied • Petroleum jelly - other-applied 0 20 40 60 80 100 120 140 TIME seconds Figure 2. Self-applied and other-applied time-intensity evaluations of petroleum jelly. Mean values at each sample time are indicated along with the 95% confidence intervals for the mean. almost daily. Four subjects used such products 1-3 times per week. The remaining 16 subjects used such products only occasionally (seven subjects) or never (nine subjects). However, 18 of the 20 subjects regularly used bath soap that contained moisturizers or lotions. These demographics were not sufficient to perform any difference testing other than comparing the "occasionally" 7 subjects to the "never" 9 subjects no significant differences were observed. DISCUSSION The TI approach clearly provides more information on the product evaluation than a single-point assessment. The decreasing trend with time is readily observed this trend may not have been detected using a single-point rating. The lotion and petroleum jelly products were selected as being two different types of products. Subjects could easily distinguish between these two. The lotion maintained a soothing intensity at a higher degree, i.e., the rate of decrease was slower relative to the petroleum jelly and bare fingers. Bare-fingers application was included in the design as a reference point. While there may be a low level of "soothing" initially, the intensity dropped off to the point of basically being "not soothing at all."

TIME-INTENSITY "SOOTHING" EVALUATION 121 i i i o o Bare fingers - self Bare fingers - other 20 40 60 80 100 120 140 TIME seconds Figure 3. Self-applied and other-applied time-intensity evaluations produced during bare-fingers rubbing motions. Mean values at each sample time are indicated along with the 95% confidence intervals for the mean. Table II Regression Slopes (n = 20 for each sample) for the Time Period 30 Seconds to 120 Seconds Sample Application Slope Lotion Self -0.018 + 0.0019 Lotion Other -0.013 + 0.0022 Petroleum jelly Self -0.026 + 0.0024 Petroleum jelly Other -0.024 + 0.0023 Bare fingers Self -0.027 + 0.0029 Bare fingers Other -0.024 + 0.0027 • Slope units are "soothing" rating/second The mean +95% confidence intervals are presented. The hypothesis that self-applied product samples would be perceived as more soothing than other-applied was substantiated. "Self-applied" ratings were significantly higher than "other-applied" in all cases. In other words, consumers may rely on sensory infor- mation provided by both the applying tactile receptors (i.e., the fingers) and the re- ceiving surface tactile receptors (i.e., the skin).