Myopic ant

When the diffusing species come in contact with a closed site (such as the villi sites of the model) they have two options. In the first option, the particle does not feel the presence of the closed site, and it may attempt, unsuccessfully, to go to it. This model is called the blind ant model. In the second model, the particle feels the presence of the closed site, and thus it never attempts to land on it. This is called the myopic ant model. The difference between these two models is that the blind ant consumes long times in unsuccessful attempts, and thus its motion is slower than the myopic ant case. 

Overall, the biased random walk, which places more emphasis on the motion toward the output end and less on the other directions, mimics more closely the transit profile of the experimental data. Both diffusion models, i.e., the blind and the myopic ant models, can reproduce the basic features of the real small-intestinal transit profile. 

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