Voice and an avatar lifted shopping-assistant ratings—but what caused the effect?
In a simulated store, 312 participants rated a text-voice-avatar assistant more highly than a text-only version. Because the experiment changed several features at once, it cannot say which feature mattered or whether sales would change.
The short version
- What happened
- The peer-reviewed online experiment recruited 320 people and retained 312 after screening on a simulated e-commerce platform.
- Who it affects
- Shoppers may find richer assistants more engaging, but engagement is not proof of better-value or less pressured decisions.
- What remains unproven
- The two conditions differ on several design dimensions, preventing attribution to voice, avatar or synchronisation alone.
Keep in mind
The two conditions differ on several design dimensions, preventing attribution to voice, avatar or synchronisation alone.
The platform and journey were simulated; no real purchase, return, spending or retention outcome was measured.
The accepted article is citable and peer reviewed but still awaiting final production edits.
Source analysis · 1 linked source. Primary analysed source date: 19 October 2026.
Read the full report · 3 min The evidence, methods, implications and limitations
A strong rating difference in a simulated store
A peer-reviewed experiment reports that people rated a shopping assistant with text, voice and an animated avatar more positively than a text-only version. Researchers recruited 320 participants through Prolific and retained 312 after screening. Participants were assigned between the two interface configurations on a simulated e-commerce platform and completed search, product-evaluation and post-purchase stages.
The richer interface was associated with higher perceived diagnosticity, immersion and satisfaction at all three stages. The largest configuration difference was in evaluation satisfaction: Cohen's d 1.58, with a 95% confidence interval from 1.33 to 1.83. Structural-equation modelling produced indirect-effect patterns consistent with diagnosticity and immersion as pathways, but the paper explicitly says these results do not demonstrate the mechanism.[1]
The bundle cannot reveal which feature worked
The comparison changed voice, avatar, number of modalities, synchronisation and social presence at once. It therefore tests one bundle against another, not the effect of voice or an avatar in isolation. The outcome is self-reported satisfaction in a simulated journey, not completed purchases, returns, spending, decision quality or long-term trust.
For retailers, this is a reason to test richer assistance carefully, especially during product comparison—not evidence to deploy persuasive avatars by default. A useful next trial would separate each design element, pre-register outcomes and measure real behaviour, accessibility, annoyance, disclosure understanding and whether vulnerable users feel pressured. The author reports no external funding and no competing interests.[1]
The distinction that matters
What changed—and what was measured
The experiment compared two complete interface bundles rather than one isolated feature.
Text only
Use a minimal shopping assistant
Baseline satisfaction ratings
Rich bundle
Add voice, animation and avatar cues
Higher reported ratings in simulation
Real commerce
Measure purchases, returns and trust
Not tested