Emotional Eaters: The Effect of Anthropomorphic Messages on Emotions, Support for Meat Tax and Animal Welfare

Last registered on December 03, 2024

Pre-Trial

Trial Information

General Information

Title
Emotional Eaters: The Effect of Anthropomorphic Messages on Emotions, Support for Meat Tax and Animal Welfare
RCT ID
AEARCTR-0014925
Initial registration date
November 28, 2024

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
December 03, 2024, 1:36 PM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Locations

Region

Primary Investigator

Affiliation
University of Hamburg

Other Primary Investigator(s)

PI Affiliation
University of Hamburg

Additional Trial Information

Status
In development
Start date
2024-12-08
End date
2024-12-20
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Background: Why do we love dogs and eat pigs? Serpell (2004) states that this inconsistency can be explained by the psychological categorization of certain animals as objects of affect and other animals as objects of utility. Research suggests that using anthropomorphic messages (i.e., messages that humanize animals) can reduce meat consumption or in other words, change the way individuals perceive animals that are typically considered objects of utility.
Objectives: To test the effectiveness of an anthropomorphic message (an image montage with voiceover) in influencing the emotional response to animal images, support for animal welfare policies and relevant individual efforts (revealed preference).
Method: We use an online survey and a within as well as between-subjects research design on a demographically representative, German sample of 1,500 participants. Those in the control group would not see any montage. Those in the experimental groups would watch a montage containing an anthropomorphic and emotional message about “farm animals”. The hypothesis is that participants in the experimental group will have a different emotional response to the images of farm animals than those in the control, greater support for policies supporting animal welfare and plant-based products, pay more for meat-replacement products, and donate more to an animal welfare charity.
External Link(s)

Registration Citation

Citation
Damania, Mrunali and Grischa Perino. 2024. "Emotional Eaters: The Effect of Anthropomorphic Messages on Emotions, Support for Meat Tax and Animal Welfare." AEA RCT Registry. December 03. https://doi.org/10.1257/rct.14925-1.0
Sponsors & Partners

Sponsors

Experimental Details

Interventions

Intervention(s)
This study employs a mixed experimental design, combining within-subjects and between-subjects elements with random assignment to one of five groups to examine the effects of animal imagery and species-specific video content on emotions and support for animal welfare policies.
Experimental Conditions
Group 1 (Pure Control Group): Participants receive no animal-related stimuli.
Group 2 (Image-Only Control Group): Participants view images of all six animals and rate their emotional responses to these images.
Group 3 (Real Cow Video + Images): Participants first view a video about cows (with images of real cows), then images of all six animals, and subsequently rate their emotional responses.
Group 4 (Cow Video + Images): Participants view a video about cows (with AI-generated images), followed by images of all six animals and emotional rating.
Group 5 (Real Pig Video + Images): Participants view a video about pigs (with images of real pigs), followed by images of all six animals and emotional rating
Intervention (Hidden)
Group 1 is pure control group; it does not receive any treatment.
Group 2 views images of six different animals (3 pet and 3 farm animals) and rates the emotions aroused as a result of viewing the images.
Group 3 first views a video about cows (made with images of real cows) and then views the same animal images as in group 2 followed by rating the emotions aroused.
Group 4 first views a video about cows (made with AI-generated images of cows) and then views the same animal images as in group 2 followed by rating the emotions aroused.
Group 5 first views a video about pigs (made with images of real pigs) and then views the same animal images as in group 2 followed by rating the emotions aroused.

The treatment videos include an audio narrating an anthropomorphic message about either cows or pigs, establishing that animals have human characteristics. The videos also include a montage of real or AI-generated images of animals to illustrate the message. The audios of the videos are verbatim identical. Only the names of the animals vary. For group 3 and 5, the images in the video are of real animals and different from those in the video for group 4, where AI-generated images of cows are used.
Intervention Start Date
2024-12-08
Intervention End Date
2024-12-20

Primary Outcomes

Primary Outcomes (end points)
1. Stated support for reduction of VAT on plant-based products from 19% to 7%; indicated by choosing one of the following responses: ‘yes’, ‘no’, or ‘abstain’.
2. Stated support for increase of VAT on meat and meat-based products from 7% to 19%; indicated by choosing one of the following responses: ‘yes’, ‘no’, or ‘abstain’.
3. Stated support for increased share of plant-based products served in public facilities; measured as a continuous variable (on a slider to choose any integer value between 10% and 100% – starting position 50%).
4. Revealed preference: Donating part of a cash lottery prize of 100€ (one winner per treatment, i.e., 1 out of 300) to an animal welfare NGO; measured as a continuous variable (on a slider to choose any integer value between 0% and 100% – starting position 67%). The amount not donated is paid to participants in the form of additional panel points (standard form of payment for participating in survey for panel members).
5. Revealed preference: Willingness-to-pay for a package of high-quality meat-replacement products (content described in detail to participants). Implemented by participation in a lottery (one winner per treatment, i.e., 1 out of 300). Participants decide on which of two prize options they prefer: prize money (5€ or 10€ or 15€ or 20€; randomly displayed) paid in the form of additional panel points (standard form of payment for participating in survey for panel members) or the package of high-quality meat-replacement products worth 25€. The latter will be sent to winners if they choose it over the cash prize.
6. Stated intention to participate in a demonstration for animal welfare; indicated by choosing one of the following responses: Definitely not, Very unlikely, Maybe, Very likely, Definitely, I don’t know/ no answer.
7. Emotional Responses: Participants rate the intensity of ten emotions (Love, Empathy, Happiness, Care, Guilt, Fear, Anger, Sadness, Shame, Concern) induced by the animal images on scales 5-point scales.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
This study employs a mixed experimental design, combining within-subjects and between-subjects elements with random assignment to one of five groups to examine the effects of animal imagery and species-specific video content on emotions and support for animal welfare policies.
1. Groups and Treatments:
o Group 1 (Pure Control Group): Participants receive no animal-related stimuli.
o Group 2 (Image-Only Control Group): Participants view images of all six animals and rate their emotional responses to these images.
o Group 3 (Real Cow Video + Images): Participants first view a video about cows (with images of real cows), then images of all six animals, and subsequently rate their emotional responses.
o Group 4 (Cow Video + Images): Participants view a video about cows (with AI-generated images), followed by images of all six animals and emotional rating.
o Group 5 (Real Pig Video + Images): Participants view a video about pigs (with images of real pigs), followed by images of all six animals and emotional rating

2. Outcome Variables:
o Emotional Responses: Participants rate the emotions elicited by the animal images.
o Support for Animal Welfare Policies: Measured through a series of policy-support questions.
o Individual Actions: Items assessing participants’ revealed-preferences and stated-preference for actions related to animal welfare.

The data will be collected by a survey company (Bilendi) in November-December 2024. The sample will include 1,500 German adult participants from the survey panel of the company. The company will contact the participants via email. The participants are requested to provide informed consent to participate in the study. The survey includes an attention/bot check and only those who pass the check are taken through the entire 15-minute survey. The survey company will also screen out all participants that complete the survey in less than 25% of the median time taken to complete the survey.
The sample will include 750 men and women each and the quota for other genders is open. The age range will be 18-74 [18-29 (20\%), 30-39 (20\%), 40-49 (20\%), 50-59 (20\%), 60-74 (20\%)]. The sample will include people with different levels of formal education [Without Abitur (High school diploma): (60\%); With Abitur: (40\%)].
All participants will be meat consumers. This is to check the effectiveness of the videos in enhancing support for animal welfare, specifically among meat consumers.
Experimental Design Details
Randomization Method
randomization into treatments is computer based and performed by the survey company
random draws of winners to the lotteries is computer based and performed by the researchers after completion of the survey
Randomization Unit
individual
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
1,500 individuals
Sample size: planned number of observations
1,500 individuals
Sample size (or number of clusters) by treatment arms
300 individuals
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
As this is the first study we are aware of that uses this combination of intervention types and outcome variables, we have no priors for the variance in the outcome variables.
Supporting Documents and Materials

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IRB

Institutional Review Boards (IRBs)

IRB Name
Ethics Committee of the Faculty WISO, University of Hamburg
IRB Approval Date
2024-11-25
IRB Approval Number
2024-028

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials