Excerpt: Concluding that cognitive structures and instruments are unconditional or arbitrary because they are not, and cannot be derived from external boundary conditions, is mistaken, since internal boundary conditions must also be taken into account. Firstly, there are the developmental constraints of cognitive evolution itself; cognitive as well as organic evolution is subject to what has been evolved before. Cognitive evolution in our time, therefore, would find rather limited degrees of freedom. Further, cognitive instruments exert themselves in continuous co-evolution with organic instruments for meeting organically defined needs and requirements. This means that cognitive systems cannot be explained by reference to what is called their object, but only through their organic genesis. This justifies efforts made to look for a closer relationship between cognitive and organic evolution.