Experimental Design Details
Participants are randomly selected from an opt-in online panel maintained by a Japanese survey firm, stratified by age (6 groups; 18-29, 30-39, 40-49, 50-59, 60-69, 70 and above), region (8 regions), and sex (male and female).
After indicating their agreement or disagreement with a gender-neutral policy issue, participants will listen to one of the six randomized recordings (see "Intervention").
Policy agreements are measured using a 5-point scale: Agree, Somewhat Agree, Neither Agree nor Disagree, Somewhat Disagree, and Disagree. We then create a dummy variable that assigns one ("Agree") to respondents who either agree or somewhat agree, and zero ("Disagree") otherwise. This approach includes "Neither Agree nor Disagree" in the "Disagree" category, based on previous social psychology studies: it has been documented that Japanese respondents often select the midpoint on 5-point Likert scales. Especially concerning social policies, those who somewhat disagree often choose "Neither Agree nor Disagree" due to social desirability biases (Ogawa 2020).
They will then evaluate the candidate on three scales:
1) Likelihood of voting for the candidate.
2) Perceived potential of the candidate as a future leader.
3) Assessment of the candidate’s capability.
All three variables are measured on a 4-point scale ( “Very likely to vote” – “Very unlikely to vote” for the first variable; “Very likely to succeed as a future political leader” – “Very unlikely to succeed as a future political leader” for the second variable; “Very competent” – “Very incompetent” for the third variable).
Post-evaluation, agreement or disagreement with the candidate's policy stance is recorded along with demographic information (party affiliation, sex, education, age, height, self-reported voice pitch). We also track whether participants listened to the audio completely, skipped portions, or replayed the audio multiple times. We will examine whether this information moderates or mediates the results.
Citation:
Ogawa, K. (2020) "Does the Mid-point of Likert Scale Have an Impact on the Opinion on Social Policy?" Sociological Theory and Methods