Categorical Perception results from experience w/ non-necessary arrangements of category boundaries, those that are used in performing some task in a culture will be used frequently
2 sources on the language effects on thought:Cognitive Tool and Dimension of ContrastCognitive Tool[counting, spatial vocab]-domain is not found in some languages
-explicitly taught
-individual differences in mastery
-difference across languages that have this domain is in the basic architecture (different bases in counting)Dimension of Contrast [sounds, count-mass distinction]-all languages have the domain
-difference across languages is in where boundaries lie within the doman
-it is required unconsciously
-and all speakers have mastery of it