&amp;gt;&amp;gt; its few but gigantic neurons inspired researchers to essentially create an aplysia mini-brain out of a sensory neuron and a motor neuron. &amp;gt;&amp;gt; we take those out of the animal and we put them into cell culture, and they grow together, and then we have a mini circuit, a neural circuit. &amp;gt;&amp;gt; scientists can see on a cellular level, what happens as the mini-brain forms a memory.