21. Habituation can be an important factor as well.22. When odorants are mixed, the conditioned odorant is blocked out because of habituation . 23. A prerequisite to studying them, habituation requires daily visits over about three years. 24. If the animals start screaming it would be an indication they have lost their habituation . 25. "Potentiation of habituation " is observed when tests of spontaneous recovery are given repeatedly. 26. Some habituation procedures appear to result in a habituation process that last days or weeks. 27. Some habituation procedures appear to result in a habituation process that last days or weeks. 28. This is considered long-term habituation . 29. Habituation can refer to a decrease in behavior, subjective experience, or synaptic transmission.30. The habituation / dishabituation procedure is also used to discover the resolution of perceptual systems.