During which period all family members worked at productive tasks differentiated by sex and age.

During the Mexican and American border crossings the Autonano model was introduced that describes about the  family members working at productive tasks.

Explanation:

Based on the Antunano model,  The craftshop moved to the factory that entire families including women can get integrated with it. The work was assigned according to the gender accent the ordering of task differentiation according to the traditional male-female work.

This model is mainly for the motivation and justification. Woman had to work in factory and not to remain idle at home. The factory continued the hierarchical gender relationship that shaped the workshop. These relationships are based on the tasks and rights within the family.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.