This document discusses several theories of motivation in second language acquisition: 1. Gardner's socioeducational model focuses on social attitudes and the relationships between language communities, distinguishing integrative and instrumental motivation. 2. Deci and Ryan's self-determination theory proposes that motivation varies along a continuum from amotivation to autonomous intrinsic motivation and involves innate psychological needs. 3. Dörnyei's process model of motivation analyzes motivation at different stages of goal pursuit and how it fluctuates over time based on learning experiences and self-regulation. 4. The L2 Motivational Self System incorporates ideas of possible future selves that motivate language learning through imagery and senses.