1) Edward Lee Thorndike was an American psychologist who pioneered research in human and animal learning through experiments using puzzle boxes with cats.
2) He developed the law of effect, which states that behaviors followed by satisfying consequences become strengthened through repeated experiences.
3) Thorndike's theory of connectionism represented the original stimulus-response framework of behavioral psychology, where learning occurs through associations forming between stimuli and responses that are strengthened or weakened based on experiences.