Aplysia Memory Simulator 🐌🧠

An interactive educational simulation demonstrating the biological principles of memory and learning using the classic Aplysia californica (sea slug) gill-withdrawal reflex model.

This application visualizes how behaviors change at both the macroscopic (organism) and microscopic (synaptic) levels through habituation, sensitization, spaced repetition, and synaptic pruning.

🌟 Features

• Interactive Organism View: Clickable anatomical parts (Siphon and Tail) to apply different types of stimuli.
• Real-time Cellular Observation: A visual representation of the sensory-motor synapse that physically changes (releases neurotransmitters, grows new branches, or prunes them) based on the organism's learning state.
• Dynamic Dashboard: Tracks your training progress, current learning state, total interactions, and the risk of memory extinction.

🧠 Biological Concepts Simulated

This app simulates the Nobel Prize-winning neuroscience research of Eric Kandel. It demonstrates:

1. Habituation: A decrease in response to a benign stimulus when it is repeated continuously.
2. Short-Term Sensitization: An exaggerated response to a benign stimulus following a noxious (painful) stimulus, driven by chemical changes at the synapse.
3. Long-Term Memory (Spaced Repetition): The formation of a permanent memory and structural synaptic growth requiring repeated, spaced training intervals.
4. Extinction (Synaptic Pruning): The loss of a learned behavior and structural regression when a long-term memory is no longer reinforced.

🚀 How to Use the Simulator

Follow the instructions in the Activity Panel to experiment with the sea slug's learning states:

1. Baseline & Habituation

• Action: Click the 👆 SIPHON multiple times in a row.
• Observation: Initially, the slug will withdraw its gill normally. After 5 consecutive touches, the organism becomes Habituated. The synaptic vesicles deplete, and the gill withdrawal becomes very weak.

2. Short-Term Sensitization

• Action: Click the ⚡ TAIL (noxious shock), followed by the 👆 SIPHON.
• Observation: The noxious shock overrides habituation. The synapse is flooded with neurotransmitters (chemical change), resulting in an exaggerated, strong gill withdrawal.

3. Long-Term Sensitization (Learning)

• Action: Perform a spaced repetition training sequence by alternating: ⚡ TAIL → 👆 SIPHON. Repeat this exact sequence 5 times.
• Observation: Watch the "LT Training Progress" bar. Once you hit 5/5, Long-Term Memory is achieved. Gene expression is activated, and you will see a new synaptic branch physically grow in the Cellular Observation Panel (structural change).

4. Extinction (Forgetting)

• Action: Once Long-Term Memory is established, click the 👆 SIPHON 5 times in a row without shocking the tail.
• Observation: Watch the red "Pruning Risk" bar. Because the connection is no longer being reinforced by the tail shock, the memory undergoes extinction. The new synaptic branch will structurally retract (prune), and the slug returns to a habituated state.

Resetting

At any time, click the 🔄 Reset Organism to Naive State button to clear all progress and return the slug to its baseline condition.