The Cognitive Cost of Immersion: Experimental Evidence from VR-Based Technical Training

As immersive technologies increasingly permeate education and professional training, their cognitive implications for novice learners remain underexplored. This study examines the relative effectiveness of virtual reality (VR)-based instruction compared with conventional teaching modalities in a controlled experimental setting. A total of 106 undergraduate medical students with no prior technical experience were randomly assigned to one of three instructional conditions: (1) PowerPoint-based presentation, (2) real-person demonstration, or (3) immersive VR simulation of a five-axis CNC machine. Participants’ cognitive ability was assessed using Raven’s Progressive Matrices, and their learning styles were measured via the Honey and Mumford questionnaire. Immediate knowledge retention was evaluated through a 20-item multiple-choice test. Results revealed a significant main effect of instructional method on post-test performance (p < 0.001), with the real-person group achieving the highest mean score, followed by PowerPoint and VR groups. IQ was a significant predictor of performance across conditions but did not moderate the effect of instructional method. Gender and learning-style preferences showed no meaningful associations with learning outcomes. The findings suggest that, for novice learners engaging with complex technical content, immersive VR may impose additional cognitive demands that hinder immediate knowledge acquisition. These results contribute empirical support to Cognitive Load Theory and the Cognitive Affective Model of Immersive Learning, emphasizing the need for careful instructional design and cognitive scaffolding in VR-based education.