Speed/accuracy tradeoff in force perception.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Haptic Perception

Background:

• A known speed-accuracy tradeoff exists in decision-making under uncertainty.
• Diffusion models explain response time and accuracy changes based on decision difficulty and strategy.
• Previous applications were limited to visual stimuli, with analysis primarily using quantile-probability (QP) plots.

Purpose of the Study:

• To extend diffusion modeling to the haptic modality.
• To introduce and evaluate a novel JND quantile analysis for model fitting.
• To investigate the relationship between response time, force discrimination, and strategic prioritization.

Main Methods:

• Participants performed a binary classification task for hand-applied force stimuli (high/low).
• Diffusion model analysis was applied to response probabilities and reaction times (RTs).
• Just noticeable difference (JND) values were calculated for different RTs, creating JND quantile plots.

Main Results:

• Diffusion models adequately captured response patterns under speed or accuracy prioritization in haptics.
• JND quantile analysis revealed that slower responses enhance force discrimination up to a certain point.
• This improved discrimination plateau was independent of prioritization instructions, contrasting diffusion model predictions.

Conclusions:

• The diffusion model shows promise for haptic perception but requires refinement.
• JND quantile analysis offers a valuable complement to QP plots for evaluating diffusion models.
• This approach should be extended to other modalities, including vision, for comprehensive model assessment.