Participants in this group will interact with two AI-based chatbots, one after the other:

First Chatbot (Psychoeducation Phase): The first chatbot is designed to provide psychoeducation about depression. Participants will interact with the chatbot to learn key information, such as common symptoms of depression, causes, treatment options, coping strategies, and how to provide emotional support to others experiencing depression. The goal of this phase is to improve participants' understanding of depression and reduce stigma.

Second Chatbot (Empathy and Support Practice Phase): After completing the psychoeducation phase, participants will interact with a second chatbot simulating a person experiencing depression. This chatbot will simulate real-life conversations, allowing participants to practice empathetic communication, recognize signs of depression, and offer appropriate emotional support.

Participants in this group will not receive any intervention or access to the Chatbots. Participants will be directed to a depression-related article and a video describing the lived experience of a depression patient.

Participants in this group will complete the same baseline and post-study assessments as those in the intervention group, which include measures of depression literacy, attitudes toward depression, help-seeking intentions, and confidence in helping others.

Participants will interact with the AI Depression Education Teacher, an interactive chatbot designed to provide psychoeducation on depression. The chatbot covers topics such as depression symptoms, causes, treatment options, and ways to support individuals experiencing depression. Participants engage in structured conversations and receive real-time feedback to reinforce learning.

The intervention consists of two AI-based chatbots designed to enhance depression literacy, reduce stigma, and improve confidence in supporting others with depression.

AI Depression Education Teacher - This chatbot provides interactive psychoeducation on depression, covering symptoms, causes, treatments, and ways to support others. Participants engage in a structured conversation to enhance their understanding and receive real-time feedback.

AI Depression Patient Simulation ("Beibei") - Participants interact with a simulated individual experiencing depression to practice empathetic communication and support strategies. Through guided conversations, they learn to recognize depressive symptoms, offer emotional support, and encourage help-seeking.

This two-phase intervention provides both knowledge and practical experience in a safe, interactive environment. Participants will engage with both chatbots sequentially within a one-hour session.

The Depression Literacy Scale is a 22-question survey that assesses a person's depression literacy. The questions are rated on a scale of "true", "false", or "I don't know". Each correct answer is worth one point, with higher scores indicating a higher level of depression literacy.

The Depression Literacy Questionnaire assesses mental health literacy specific to depression. It is a self-developed, 31-item questionnaire designed to assess participants' confidence in providing support to individuals experiencing depression. Each item is rated on a 5-point Likert scale, ranging from 1 ("Strongly Disagree") to 5 ("Strongly Agree"), with higher scores indicating greater depression literacy.

The Depression Stigma Scale is designed to measure stigma associated with depression. It has two subscales which measure two different types of stigma: personal and perceived. The Personal Stigma Subscale measures stigma in the respondents own attitudes towards depression by asking them to indicate how strongly they personally agree with nine statements about depression. The Perceived Stigma Subscale measures the respondent's perception about the attitudes of others towards depression by asking them to indicate what they think most other people believe about the same nine statements. Responses to each item are measured on a five-point scale (ranging from zero 'strongly disagree' to four 'strongly agree'). Higher scores indicate higher levels of depression stigma.

The Attribution Questionnaire (AQ) is a 9-item self-report assessment tool designed to measure public stigma towards people with mental illnesses. This version assesses emotional reaction and discriminatory responses based on answers to a hypothetical vignette about a man with depression named Xiao Li. Responses assessing stigma towards Xiao Li are in the form of 9 items rated on a Likert scale ranging from 1 (not at all) to 9 (very much).

The Patient Health Questionnaire (PHQ-9) consists of 9 items designed to assess the severity of depressive symptoms over the past two weeks. Each item corresponds to one of the nine DSM-5 criteria for major depressive disorder and is rated on a 4-point Likert scale, ranging from 0 ("Not at all") to 3 ("Nearly every day"), with higher scores indicating greater symptom severity.