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Artificial Intelligence: Emotions

Aaron Krumins - Blueprints - Jul 20, 2018

Add life like behavior and expression to your NPCs with these high fidelity representations of human and animal emotions.

  • Supported Platforms
  • Supported Engine Versions
    4.19 - 4.27
  • Download Type
    Complete Project
    This product contains a full Unreal Engine project folder, complete with Config files, Content files and .uproject file, which can be used as a template to create a new project.

Example Video:

The AI Emotions toolkit simulates a wide variety emotions found in humans and other mammals. Drawing from recent neuroscientific research, it can generate a broad spectrum of emotions based upon the objects and experiences the agent encounters in it's environment. These include:

· Joy

· Distress

· Hope

· Fear

· Satisfaction

· Frustration

· Uncertainty

The Emotions Toolkit is an entire behavior system designed to equip an NPC with realistic emotional responses. In humans , the decision making system that underpins our emotions takes the form of dopamine based model-free reinforcement learning (intuitive, unconscious decisions making). The Q-learning algorithm(included) can approximate the strategic decisions made by humans and is used in the toolkit to generate behaviors that then drive the agent's emotional responses.

Emotions in this case are used both for communicating the NPC's current relation to its goal state(s), but also for guiding strategic decisions . This closely corresponds with the way emotions serve dual purposes in biological reinforcement learners such as ourselves.

While an understanding of Q learning is not required for making use of the emotions package provided, it will be helpful. Refer to the Q Learning Project in the Unreal Marketplace

Technical Details


  • Replicates the psychological and behavioral dynamics of emotions found in humans
  • Draws from the latest neurosientific research  
  • Easy to setup and implement
  • Scales to a wide variety of game environments
  • Creates more lifelike behavior from NPCs, even non-human ones

Number of Blueprints: 8

Input: NA

Network Replicated: No

Supported Development Platforms: ALL

Supported Target Build Platforms: UE 4.21

Documentation: Included with Project Files

Important/Additional Notes:

The context in which the AI Emotions system is deployed here is a match to sample puzzle in which the NPC learns that it must activate a switch within the game environment at the same time that a light is on in order to receive a “food reward”. The agent uses Q learning to predict that it can take an action to receive a reward only during specific circumstance, in this case, when a light is on and it first touches a switch. The same action taken when the green light is off will not generate the reward. Emotions are displayed in the context of the rewards or punishments the agent receives from interacting with its environment.

Several assets are inherited from the AI Q Learning Project available in the Unreal Marketplace. They will not be explained in this project as separate documentation exists for them under that offering.