or the use of linguistic expressions Whether the focus of linguistic relativity is in language or in the brain Lakoff concluded that many of Whorf's critics had criticized him using novel definitions of linguistic relativity, rendering their criticisms moot. Refinements Researchers such as Boroditsky, Choi, Majid, Lucy and Levinson believe that language influences thought in more limited ways than the broadest early claims. Researchers examine the interface between thought (or cognition), language and culture and describe the relevant influences. They use experimental data to back up their conclusions. Kay ultimately concluded that "[the] Whorf hypothesis is supported in the right visual field but not the left". His findings show that accounting for brain lateralization offers another perspective. Behavior-centered research Recent studies have also taken the "behavior centered" approach, which starts by comparing behavior across linguistic groups and then searches for causes for that behavior in the linguistic system. In an early example of this approach, Whorf attributed the occurrence of fires at a chemical plant to the workers' use of the word 'empty' to describe the barrels containing only explosive vapors. More recently, Bloom noticed that speakers of Chinese had unexpected difficulties answering counterfactual questions posed to them in a questionnaire. He concluded that this was related to the way in which counter-factuality is marked grammatically in Chinese. Other researchers attributed this result to Bloom's flawed translations. Strømnes examined why Finnish factories had a higher occurrence of work related accidents than similar Swedish ones. He concluded that cognitive differences between the grammatical usage of Swedish prepositions and Finnish cases could have caused Swedish factories to pay more attention to the work process while Finnish factory organizers paid more attention to the individual worker. Everett's work on the Pirahã language of the Brazilian Amazon found several peculiarities that he interpreted as corresponding to linguistically rare features, such as a lack of numbers and color terms in the way those are otherwise defined and the absence of certain types of clauses. Everett's conclusions were met with skepticism from universalists who claimed that the linguistic deficit is explained by the lack of need for such concepts. Recent research with non-linguistic experiments in languages with different grammatical properties (e.g., languages with and without numeral classifiers or with different gender grammar systems) showed that language differences in human categorization are due to such differences. Experimental research suggests that this linguistic influence on thought diminishes over