Davis J D, Kung T M, Rosenak R
Department of Psychology, University of Illinois at Chicago 60680, USA.
Physiol Behav. 1995 Jun;57(6):1081-7. doi: 10.1016/0031-9384(95)00008-7.
The microstructure of the ingestive behavior of rats ingesting corn oil emulsions was analyzed to describe quantitatively how postingestional stimulation interacts with orosensory stimulation to control the intake of corn oil. Seventeen hour food deprived rats were given 30-min access intake tests with corn oil emulsions ranging in concentration from 0.125% to 64%. The volume ingested showed an inverted U shaped function over this concentration range. The Weibull function fitted to the rate of licking function showed that the initial rate of licking was an increasing linear function of the log of the concentration of corn oil. The slope of the licking rate function was an increasing curvilinear function of the log of corn oil concentration. Together these results indicate that the negative feedback effect of corn oil in the gastrointestinal tract increases more rapidly at the higher concentrations of corn oil than does its orosensory stimulating effect resulting in a decrease in the volume ingested. Unlike carbohydrates, where the increase in the initial rate of licking is a result of an increase in the size of the clusters, the increase with concentration in the initial rate of ingesting corn oil was caused by an increase in the number of clusters rather than their size. This study provides a quantitative analysis of the interaction between orosensory and postingestional stimulation, two variables that play an important role in the control of ingestion of corn oil.
分析了摄入玉米油乳剂的大鼠摄食行为的微观结构，以定量描述摄食后刺激与口腔感觉刺激如何相互作用来控制玉米油的摄入量。对禁食17小时的大鼠进行了30分钟的摄入测试，测试用的玉米油乳剂浓度范围为0.125%至64%。在此浓度范围内，摄入体积呈现倒U形函数关系。拟合舔舐速率函数的威布尔函数表明，初始舔舐速率是玉米油浓度对数的递增线性函数。舔舐速率函数的斜率是玉米油浓度对数的递增曲线函数。这些结果共同表明，胃肠道中玉米油的负反馈作用在较高玉米油浓度下比其口腔感觉刺激作用增加得更快，从而导致摄入体积减少。与碳水化合物不同，碳水化合物初始舔舐速率的增加是由于团簇大小增加，而摄入玉米油初始速率随浓度增加是由于团簇数量增加而非大小增加。本研究对口腔感觉刺激和摄食后刺激之间的相互作用进行了定量分析，这两个变量在玉米油摄入控制中起着重要作用。
