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Interactive DDM Demo

Dogukan Nami Oztas

2025-05-16

shiny_app.Rmd

Interactive Drift Diffusion Model Demo

This interactive Shiny application allows you to explore the Drift Diffusion Model (DDM) by adjusting its parameters and visualizing the effects in real-time.

Features

  • Adjust core DDM parameters (drift rate, threshold separation, starting point, etc.)
  • Modify across-trial parameter variability (sv, sz, st0)
  • Visualize evidence accumulation paths
  • Explore reaction time distributions
  • See parameter effects instantly

Launch the App

Click the button below to launch the interactive DDM demonstration app:

Launch Interactive DDM Demo

Using the App

The app interface is divided into several sections:

  1. Parameter Controls - Use the sliders to adjust DDM parameters
  2. Simulation Display - View evidence accumulation paths and RT distributions
  3. Parameter Distribution - See the distribution of trial-specific parameters when using variability

Experiment with different parameter combinations to develop an intuitive understanding of how each parameter affects decision outcomes and reaction times.

Relation to Tutorial Vignettes

This interactive app complements the conceptual explanations provided in the tutorial vignettes:

  • Introduction to Random Walks - Foundation for understanding evidence accumulation
  • Simulating the DDM - Basic principles implemented in the app
  • Parameter Variability - Explore how variability affects outcomes
  • Interpreting Parameters - See the real-time effects of parameter changes

The app serves as a hands-on learning tool that brings the theoretical concepts to life through direct interaction and visualization.