Command fiber control of crayfish abdominal movement
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The crayfishProcambarus clarkii almost always extends its abdomen when it is lifted up from the aquarium floor into the water column.
Under identical stimulus conditions bothOrconectes rusticus andO. virilis rarely respond by full abdominal extension. Usually they move their abdomens to a position intermediate to extension and flexion.
Comparison of these results with those in the preceding paper (Page, 1975) reveals that extension sensitivity is correlated with the presence of extension command fibers in the circum-esophageal connectives (P. clarkii) while extension insensitivity is associated with the apparent absence of extension command fibers in these connectives (O. rusticus andO. virilis).
The correlation between presence of command fibers and extension sensitivity provides support for the assumption that command fibers control the generation of behavior patterns in animals.
KeywordsWater Column Behavior Pattern Stimulus Condition Preceding Paper Apparent Absence
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