The tendency of terror attacks to generate increased right-wing attitudes is a direct prediction from the motivated cognition approach to political ideology (Jost, 2017). However, due to methodological and theoretical problems, evidence for this 'right-shift' hypothesis is currently mixed. To address these issues, we introduce for the first-time search volume indices (SVI) analysis to the study of public opinion dynamics by assessing the effects of exposure to the 2015 Paris terror attacks, with a focus on equalitarian values related searches in the French cyberspace. Consistent with the 'right-shift' hypothesis, we demonstrate that online collective threat salience (SVI for the word 'terror attack') predicts significant decreases in equalitarian values SVI (e.g. 'equality') 6 weeks later, but not in nonequalitarian values SVI (e.g. 'liberty'). Mixed-model analyses of SVI for the period 2012-2017 confirmed these results by showing both decrease in equalitarian values SVI and no change in non-equalitarian values SVI after 2015. These findings corroborate the 'right-shift' hypothesis at the societal level using ecological-behavioural measures of public opinion and demonstrate the value of SVI analysis for theory-testing in political psychology.
Data CollectionAccording to Google (2017), Trends data is 'an unbiased sample of Google search data. from both real-time random samples of the past week SVI and non-real-time data from a random sample of SVI 'pulled from as far back as 2004 and up to 36 hours before the search'. It is then 'adjusted proportionate to the time and location of a query by dividing the total searches of the geography and time range it represents to compare relative popularity […] The resulting numbers are then scaled on a range of 0 to 100 based on a topic's proportion to all searches on all topics.' Still according to the same source, Google Trends' algorithm excludes data from 'searches made by very few people […] duplicate searches […] repeated searches from the same person over a short period of time'. Time considerations. Google Trends SVI provides relative data: the weekly proportion of search index averaged by the total sum of search indexes, which changes every week. While this is not problematic for data analysis (and