A Sound Decision? The Impact of Audio Descriptions on Economic Rationality

Last registered on November 09, 2024

Pre-Trial

Trial Information

General Information

Title
A Sound Decision? The Impact of Audio Descriptions on Economic Rationality
RCT ID
AEARCTR-0012809
Initial registration date
January 09, 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
January 09, 2024, 1:26 PM EST

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

Last updated
November 09, 2024, 7:22 AM EST

Last updated is the most recent time when changes to the trial's registration were published.

Locations

Region

Primary Investigator

Affiliation
University of Kent

Other Primary Investigator(s)

PI Affiliation
Zhejiang University

Additional Trial Information

Status
Completed
Start date
2024-01-09
End date
2024-06-15
Secondary IDs
Prior work
This trial is based on or builds upon one or more prior RCTs.
Abstract
In our previous experiment (Chen and Guan, 2021), we find a significant detrimental effect of auditory descriptions on economic rationality relative to visual descriptions. This disparity may stem from the tendency of individuals to process auditory information sequentially, as opposed to the simultaneous processing of visual information. In this follow-up experiment, we investigate this potential underlying mechanism by prompting subjects to process auditory and visual information sequentially in a tightly controlled setting. By comparing the economic rationality of the two new treatments, we aim to determine the driving mechanism affecting economic rationality when information is presented either visually or auditorily. If the experiment finds no significant differences between the Visual and Auditory Treatments, it would suggest that the sequential processing of information is the primary factor that leads to lower economic rationality when dealing with auditory descriptions. This would imply that the way information is presented (sequentially or simultaneously) is more critical than the descriptions (audio or visual). Conversely, if the disparity between the two treatments persists, it would suggest that individuals may have a comparatively lower cognitive ability to process auditory information effectively. This would indicate that the description itself plays a significant role, with auditory processing potentially being less conducive to economic rationality than visual processing.
External Link(s)

Registration Citation

Citation
Chen, Fadong and Rui Guan. 2024. "A Sound Decision? The Impact of Audio Descriptions on Economic Rationality." AEA RCT Registry. November 09. https://doi.org/10.1257/rct.12809-3.0
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Experimental Details

Interventions

Intervention(s)
In the experiment, there are two treatments: Visual Treatment and Auditory Treatment, where subjects are presented with decision problems in the form of visual and auditory information, respectively. We study between-subjects and within-subjects treatment effects. Specifically, subjects are randomly allocated into Group 1 and Group 2. There are two waves of decisions to make. In the first wave, Group 1 and 2 subjects are asked to make decisions in Visual Treatment and Auditory Treatment, respectively. In the second wave, Group 1 and 2 subjects are asked to make decisions for problems with Auditory Treatment and Visual Treatment, respectively.
Intervention (Hidden)
In the Visual Treatment, subjects can click on an option to view its visual information. Upon clicking on an option, subjects are presented with two numbers [x, y] representing a lottery that rewards x or y with equal probabilities. The digits of these numbers are sequentially shown for a duration of 1 second, with a half-second pause between x and y. Taking the option [0, 194] as an example, participants would sequentially see the digits "0", "1", "9", and "4", each displayed for 1 second, with a brief intermission after "0". It is important to note that while one option's information is being displayed, participants are unable to view details of any other options. However, they are permitted to request visual information of any option an unlimited number of times.

In the Auditory Treatment, participants can click on an option to access its auditory information. Upon clicking on an option, subjects will hear two numbers [x, y] representing a lottery that rewards x or y with equal probabilities. Each digit of these numbers is articulated sequentially for 1 second, with a 0.5-second pause between x and y. For instance, with the option [0, 194], participants will hear the digits pronounced as "0" (one), "1" (one hundred), "9" (ninety), "4" (four), each articulated separately for 1 second, with a brief interlude after "0". While the auditory information for an option is being played, subjects are not allowed to listen to other options. They are allowed, however, to listen to the auditory information for any option as many times as they want. All auditory presentations are delivered in Mandarin Chinese.
Intervention Start Date
2024-01-09
Intervention End Date
2024-06-15

Primary Outcomes

Primary Outcomes (end points)
The key outcome variables in this experiment are economic rationality measured by the choice data. They include Generalized Axiom of Revealed Preference (GARP) violations, Strong Axiom of Revealed Preference (SARP) violations, Houtman-Maks' index (Houtman and Maks, 1985), Afriat (1967, 1972)’s critical cost efficiency index (CCEI), and first-order stochastic dominance (FOSD). We will compare all consistency scores of individuals under different treatments.
Primary Outcomes (explanation)
The GARP violations index counts how many combinations of choices violate GARP. SARP differs from GARP by excluding indifference between alternatives in the preference. The Houtman-Maks' index finds the minimal subset of observations that need to be removed from the data to make the remainder rationalizable. The CCEI measures the proportion of income that a person wasted by the choices that violated revealed preference. FOSD violations represent the mistake of losing the chance to gain better outcomes without taking more risks.

Secondary Outcomes

Secondary Outcomes (end points)
Our secondary outcomes encompass participants' response times and search behavior patterns.
Secondary Outcomes (explanation)
We assess the response times that participants take to make decisions across various treatments. Additionally, we analyze their search behavior, including the number of options they consider.

Experimental Design

Experimental Design
The experiment will be conducted in the Zhejiang University laboratory. We recruit subjects via the sample pool of the Zhejiang University laboratory. The experiment consists of three sections. In the first section, subjects make economic decisions according to their allocated treatment. In the second section, subjects are asked to complete cognitive tasks. In the last section, subjects are asked to indicate their preferences on consistency and report demographic information.
Experimental Design Details
In the first section of economic decision, we adapt twenty risky decision problems adapted from Kim et al. (2018). Each decision problem comprises eleven randomly ordered options from a budget line with a unique price and endowment combination. An option (x; y) rewards x or y tokens with equal probability. There is one decision problem for comprehension check. In the second section, we measure the subjects' cognitive ability (or IQ for short) using the International Cognitive Ability Resource (ICAR) test (Condon and Revelle, 2014). We also measure selective attention by the Stroop (1935)'s task. In the third section, subjects are asked to rate their comfort with a scenario of choice inconsistency by selecting a number between zero (least comfortable) and ten (most comfortable). The scenario is based on the attraction effect (Huber, Payne and Puto, 1982), which is a common behavioral phenomenon violating consistency with preference maximization (Tversky and Simonson, 1993).
Randomization Method
The randomization will be done by the online survey tool Qualtrics.
Randomization Unit
Individual.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
We aim to recruit between 160 and 200 participants.
Sample size: planned number of observations
We aim to recruit between 160 and 200 participants.
Sample size (or number of clusters) by treatment arms
80-100 individuals in the Group 1 and Group 2, respectively.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
Academic Ethics Committee at Zhejiang University
IRB Approval Date
2024-01-08
IRB Approval Number
N/A

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
Yes
Intervention Completion Date
May 12, 2024, 12:00 +00:00
Data Collection Complete
Yes
Data Collection Completion Date
May 12, 2024, 12:00 +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
203 participants.
Was attrition correlated with treatment status?
No
Final Sample Size: Total Number of Observations
203 participants.
Final Sample Size (or Number of Clusters) by Treatment Arms
Group 1: 98 participants; Group 2: 105 participants.
Data Publication

Data Publication

Is public data available?
No

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Program Files

Program Files
No
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials