'task difficulty' is a correct and usable phrase in written English.
For example, 'With the increase in task difficulty, it was necessary to allocate more resources to the project.'.
Letter strings elicited an intermediate response (7.24 μV), probably still reflecting task difficulty.
Task difficulty appears to be judged from social norms.
These findings further our understanding of search task difficulty, the relationship between task difficulty and task type, and that between task difficulty and knowledge level.
Oxy-Hb levels were greatest with increased task difficulty.
The results indicate that task difficulty influences speech perception.
Right IFG/insula activations, however, only scaled with task difficulty.
Ahissar, M. & Hochstein, S. Task difficulty and the specificity of perceptual learning.
Results also indicate that task difficulty, more than concept specificity, determine whether a concept is missed.
Search task difficulty has been attracting much research attention in recent years, mostly regarding its relationship with searchers' behaviors and the prediction of task difficulty from search behaviors.
The attribution of success to task difficulty therefore, would be expected to modify future achievement behaviour.
Smoking abstinence significantly decreased task accuracy regardless of task difficulty.
