Abstract
Abstract: Lexical decision tasks (LDTs) are often employed to implicitly measure each hemisphere's capacity to process semantic information. Different hemispheric patterns may result from tasks with explicit semantic demands (semantic decision tasks, SDTs). We administered healthy subjects two different lateralized tasks, one LDT and one SDT (category matching task). The target word pairs were identical in both tasks and either closely or distantly semantically related. Overall, the fastest RTs were evidenced in the RVF/LH. However, individual analyses revealed a single main effect of hemifield in the LDT (RVF/LH faster than LVF/RH) and a single main effect of semantic distance (shorter latencies with closely related words) in the SDT. These findings indicate that hemispheric asymmetries depend on task demands.
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