Nominal and functional task difficulty in skill acquisition: Effects on performance in two tests of transfer

Area of Science:

• Motor learning
• Cognitive psychology
• Human movement science

Background:

• Understanding how task difficulty impacts motor skill acquisition is crucial for optimizing training.
• The challenge point framework (CPF) proposes an optimal level of task difficulty for learning.
• Nominal task difficulty (target distance) and functional task difficulty (practice progression) are key variables.

Purpose of the Study:

• To investigate the influence of nominal and functional task difficulty on motor skill transfer.
• To evaluate the predictive accuracy of the challenge point framework in different transfer contexts.
• To explore how task difficulty interacts with single-task versus dual-task conditions.

Main Methods:

• Participants learned a ballistic, target-directed finger action with varying nominal and functional task difficulties.
• Transfer of learning was assessed in both single-task and dual-task conditions.
• Performance persistence over time served as the primary measure of learning.

Main Results:

• High nominal task difficulty during practice enhanced performance persistence in single-task transfer tests.
• Intermediate combined task difficulty (nominal and functional) improved persistence in dual-task transfer tests.
• Neither extreme high nor low combined difficulty was optimal in dual-task transfer.

Conclusions:

• The impact of nominal and functional task difficulty on motor skill acquisition is context-dependent.
• The challenge point framework, in its current form, does not fully account for these complex interactions.
• Differential weighting of task difficulty factors is influenced by the transfer test environment (single vs. dual task).