Abstract “Plasticity” is a necessary concept for any theory of brain function. The most
complex products of the brain, the ongoing cognitive behaviors of the individual, are …

In this paper I suggest that play is a distinctive behavioural category whose adaptive
significance calls for explanation. Play primarily affords juveniles practice toward the …

Dendritic extent of Golgi-Cox stained layer II entorhinal cortex pyramidal neurons was
quantified in five groups of male F344 rats aged 12, 20, 27, 30 and 37 months. Over the age …

Social isolation is a pervasive problem for older adults and interventions designed to reduce
it have met with only limited success. The current research was designed to identify …

The cat's visual cortex is immature at birth and undergoes extensive postnatal development.
For example, cells of layers 2 and 3 do not complete migration until about 3 weeks after …

Much of our work with enriched experience and training in animals supports the Quartz &
Sejnowski (Q&S) thesis that environmental information can interact with pre-existing neural …

Constructivism is the most recent in a long line of failed attempts to discredit nativism. It
seeks support from true (but irrelevant) facts, wastes its energy on straw men, and jumps …

Until relatively recently, the evidence that the brain is changed by experience was based
solely on indirect behavioral assessments of changes: Training can produce long-lasting …

Quartz & Sejnowski's (Q&S's) constructivist manifesto promotes a return to an extreme form
of empiricism. In defense of learning by selection, we argue that at the neurobiological level …

There is evidence for increase, followed by decline, in synaptic numbers during
development. Dendrites do not function in isolation. A constructive neuronal process may …