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草莓小菇凉:说的非常好,十分有道理,棒棒棒!

06-08 15:44:55

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TPO 04-L1 .Displacement Activity 点击收藏

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    Listen to part of a lecture in a biology class.

    The class is discussing animal behavior.

    Ok, the next kind of animal behavior I want to talk about might be familiar to you.

    You may have seen, for example, a bird that's in the middle of a mating ritual, and suddenly it stops and preens, you know, takes a few moments to straighten its feathers, and then returns to the mating ritual.

    This kind of behavior, this doing something that seems completely out of place, is what we call a "Displacement Activity".

    Displacement activities are activities that animal's engaging in when they have conflicting drives.

    If we take our example from a minute ago, if the bird is afraid of its mate, it's conflicted.

    It wants to mate but it's also afraid and wants to run away.

    So, instead, it starts grooming itself.

    So, the displacement activity, the grooming, the straightening of its feathers, seems to be an irrelevant behavior.

    So, what do you think another example of a displacement activity might be?

    How about an animal that, um, instead of fighting its enemy or running away, it attacks a plant or a bush?

    That's really good suggestion, Karl. But that's called "redirecting".

    The animal is redirecting its behavior to another object, in this case, the plant or the bush.

    But that's not an irrelevant or inappropriate behavior.

    The behavior makes sense.

    It's appropriate under the circumstances.

    But what doesn't make sense is the object that the behavior is directed towards.

    Ok, who else? Carol?

    I think I read in another class about an experiment where an object that the animal was afraid of was put next to its food - next to the animal's food.

    And the animal, it was conflicted between confronting the object and eating the food, so instead, it just fell asleep.

    Like that?

    That's exactly what I mean.

    Displacement occurs because the animal's got two conflicting drives - two competing urges, in this case, fear and hunger.

    And what happens is, they inhibit each other, they cancel each other out in a way, and a third seemingly irrelevant behavior surfaces through a process that we call "Disinhibition".

    Now in disinhibition, the basic idea is that two drives that seem to inhibit, to hold back, a third drive.

    Or, well, they're getting in a way of each other in a... in a conflict situation and somehow lose control, lose their inhibiting effect on that third behavior, which means that the third drive surfaces, it's expressed in the animal's behavior.

    Now, these displacement activities can include feeding, drinking, grooming, even sleeping.

    These are what we call "Comfort Behavior".

    So why do you think displacement activities are so often comfort behaviors, such as grooming?

    Maybe because it's easy for them to do?

    I mean, grooming is like one of the most accessible things an animal can do.

    It's something they do all the time, and they have the stimulus right there on the outside of their bodies in order to do the grooming, or if food is right in front of them.

    Basically, they don't have to think very much about those behaviors.

    Professor, isn't it possible that animals groom because they've got messed up a little from fighting or mating?

    I mean if a bird's feathers get ruffled or an animal's fur, maybe it's not so strange for them to stop and tidy themselves up at that point.

    That's another possible reason although it doesn't necessarily explain other behaviors such as eating, drinking or sleeping.

    What's interesting is that studies have been done that suggest that the animal's environment may play a part in determining what kind of behavior it displays.

    For example, there's a bird, the "wood thrush".

    Anyway, when the "wood thrush" is in an attack-escape conflict, that is, it's caught between the two urges to escape from or to attack an enemy, if it's sitting on a horizontal branch, it'll wipe its beak on its perch.

    If it's sitting on a vertical branch, it'll groom its breast feathers.

    The immediate environment of the bird, its immediate, um, its relationship to its immediate environment seems to play a part in which behavior will display.

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