We’re living in a world where Generative AI (GenAI) is becoming increasingly sophisticated. While it’s a boon for many sectors, it also poses unique challenges for academia. One pressing question for educators is: “Are my students using GenAI to complete their assignments?”
The Attention Span Dilemma 🚨
Before diving into the hidden text trick, it’s worth noting a significant trend: shortening attention spans among younger generations. Studies suggest that the average attention span is shrinking, and many students prefer bite-sized information. This trend increases the likelihood that students will overlook hidden prompts, making this method even more effective.
The Hidden Text Trick 📝
If you’re concerned about this, there’s a clever way to find out: hidden white text prompts in your PDF assignments. By embedding these invisible prompts in the assignment PDF, you can create a unique identifier that can help you recognize GenAI-generated content when grading papers.
How It Works 🛠️
- Create the Assignment: As usual, draft your assignment in a word processor.
- Insert Hidden Prompts: Add specific prompts or questions in white text, making them invisible against the white background of the document.
- Convert to PDF: Save the document as a PDF.
- Distribute: Share the PDF assignment with your students.
The Grading Reveal 🕵️♀️
When grading, look for responses to the hidden prompts. If a student’s paper addresses these invisible questions, it’s a strong indicator that GenAI was used to complete the assignment. This is because GenAI scans the entire document, including the hidden text, and generates content based on it.
The Ethical Angle 🤔
While this method can be effective, it’s essential to approach it with ethical considerations in mind. Make sure to:
- Be Transparent: Inform students that you have methods to detect GenAI-generated content.
- Offer Alternatives: Encourage students to use GenAI as a supplementary tool for research or idea generation, rather than for completing assignments.
- Educate: Use this as an opportunity to educate students on the responsible use of AI in academics.
The use of hidden white text prompts in PDFs offers a unique way to detect GenAI usage in student assignments. While it’s not foolproof, it adds an extra layer of accountability and integrity to the academic process. As educators, it’s our responsibility to adapt and find innovative solutions to the challenges posed by emerging technologies, including the ever-shortening attention spans of our students.





