When we think of the word ‘‘contagious,’’ we often think of something negative, like the flu. But transmitted diseases aren’t the only thing that can quickly spread within a society—certain feelings, emotions, and behaviors can be easier to catch than the common cold. Does seeing others laugh or yawn make you want to do it too? You’re definitely not alone—‘‘behavioral contagion,’’ or the tenden...

Reversible acetylcholinesterase inhibitor donepezil displays prophylactic effects against intoxication with irreversible organophosphorous acetylcholinesterase inhibitors. We used behavioural observation of yawning and epileptic seizures, histochemical acetylcholinesterase staining, and in situ hybridization of the immediate early genes, c-fos and synaptotagmin 4 (Syt4) mRNAs in the brain, to e...