What is a key characteristic of the training regimen used in the Klinberg et al study?

• A. Fixed level throughout
• B. Steps up in difficulty across sessions
• C. Random levels mixed within a session
• D. Mostly non-verbal tasks only

Answer: (B)

The key idea here is progressive difficulty across sessions. In this kind of training, the tasks get harder as participants improve, so each session continues to push the limits of working memory. This adaptive approach keeps the challenge at an optimal level, helping skills to grow rather than plateauing. A fixed level would not continually stretch capacity, randomizing levels within a session would blur steady practice and learning signals, and the focus on non-verbal tasks relates to the task content rather than how the training ramps up. So the best description is that difficulty steps up across sessions.