This document provides an overview of cognitive approaches to second language acquisition (SLA). It discusses two main groups of cognitive theorists: processing approaches and emergentist/constructionist approaches. Processing approaches investigate how learners process linguistic information and develop this ability over time, focusing on computational dimensions of language learning. Emergentist approaches see language development as driven by associative learning from communicative needs and patterns in language input. Specific cognitive models discussed include McLaughlin's information processing model, Anderson's ACT model, and Pienemann's processability theory. The document also covers Slobin's perceptual saliency approach and its operating principles for first and second language acquisition.