Life-Span Developmental Psychology. Methodological Issues by John R. Nesselroade

By John R. Nesselroade

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Pipping normally occurs sometime between 24 and 27 days after the onset of incubation, with the exact time determined by the total length of incubation, which may be between 25 and 28 days from onset to hatching. Pipping generally occurs during the morning hours, between dawn and noon. The following day, usually during the morning hours, the eggs hatch, with an interval of about 6-8 hours between the first and last ducklings in the clutch. Then during the next day (or very occasionally, 2 days later), the female leaves the nest with the young for the exodus.

In the case of imprinting, biologically appropriate objects must be used in relation to each other in order for the relevant variables to be adequately investigated. Finally, it has become important to understand that all findings and data generated by the scientific investigation of behavior must be interpreted and explained in terms of actual reality. This means that the "control" in imprinting research is the actual imprinting experience between the female and 42 Eckhard H. Hess and Slobodan B.

5. Microphones and speakers are installed in the laboratory incubator and in an actual nest where a female is incubating her eggs which have begun at the same time as those in the laboratory incubator. This two-way arrangement permits the incubator eggs to have the same auditory feedback as the female's own eggs. That is, whenever the incubator eggs emit sounds, the female can then respond to them. The vocalizations of the female can be received both by her own eggs and by the incubator eggs. C.

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