to create four conditions: both prime and target attended, both unattended, or either the prime or the target attended while the other is not. N400 repetition and semantic priming effects were most consistently observed for targets whether or not they were attended (albeit much attenuated for unattended targets) as long as the primes were attended. Observations of semantic priming on target N400s by unattended primes are more variable, but have on occasion revealed some level of semantic processing, which importantly can be dissociated from behavioral priming and recognition effects.
