The present investigation is designed to establish how lexical context influences on the mismatch negativity brain potential (MMN) latency and amplitude. The MMN demonstrates an enhanced response to meaningful words over meaningless items. Increasing of amplitude in time period 100-200 ms supports to the above view on word memory traces as strongly connected assemblies of neurons. These results lend further support to the strength of internal connections in a memory circuit, which is in turn determined by lexical context. We hypothesize that different amounts of activation depend on the word’s lexical representation strength.