Altruism – performing a behavior or having a trait that benefits another individual of the same species that is costly to the actor/bearer of the trait.

Antennal lobes – glomerular neuropils receiving the olfactory receptor neurons.

Behavioral syndromes – suites of behaviors that are correlated to each other.

Cooperation – performing a behavior or having a trait that benefits another individual of the same species.

Division of labor – a phenomenon occurring in advanced social groups, where workers differ in which type of work they perform, and exchange or share the benefits from this work.

Glomeruli – in the context of the nervous system, clusters of nerve endings.

Microglomeruli – synaptic complexes with the presynaptic boutons of projection neurons (i.e. neurons connecting antennal lobe and mushroom body).

Mushroom body – lobed neuropil in the insect brain thought to be the center of sensory input integration and association. Especially well developed in the Hymenoptera.

Neuropil – dense network of nervous tissue in the brain.

Personalities – reproducible differences between individuals in behavior.

Presynaptic bouton – specialized area of the axon terminal within a presynaptic neuron containing neurotranmitters (which are housed in presynaptic vesicles).

Response threshold – Refers to a model for explaining task allocation, in which nestmates differ in their internal thresholds for responding to task-specific stimuli; low threshold workers for a given task respond to a low stimulus level for that task and high threshold individuals respond only to a high stimulus level.

Sensilla (singular: sensillum) – cuticular, hairlike sensory organs that are innervated by one or a few neurons.

Sociality – social animals live in semi-permanent groups.

Specialization – individuals perform one activity or function more often than others.

Task allocation – the process of giving each worker a task.