Submission 568
Semantic Interference as Hebbian Learning: An Integrative Framework
SymposiumTalk-04
Presented by: Merel Muylle
Incremental learning has been shown to underlie many psycholinguistic effects, from phonotactic and orthotactic constraint learning to structural priming. Recently, it has been proposed that cognitive control is also best understood as a learning mechanism. There is much debate about the role of cognitive control in resolving semantic interference in language production. Here, we propose a model of Hebbian learning that captures different kinds of semantic interference in language production. Specifically, the model successfully captures semantic interference effects across blocked cyclic naming, continuous naming, and picture-word interference (PWI) tasks, as well as congruency sequence effects found in PWI.
While the same Hebbian learning mechanism is applied to capture all of these effects, our simulations demonstrate that the critical learning happens in different parts of the system based on the kind of interference. When stimulus-driven information is sufficient to arrive at the correct response (i.e., when the target stimulus is more potent than the distractor), learning between stimulus and response is sufficient to capture semantic interference. In contrast, when stimulus-driven information more strongly signals an incorrect response (i.e., when the distractor is more potent than the target stimulus), the critical learning happens between task-demand and task-specific stimulus representations. In addition to accounting for behavioral findings, this framework can account for seemingly discrepant neural data obtained from a variety of semantic interference tasks.