🍄 Serotonin 5-HT2A Receptor Psychedelic Mechanism Simulator

Psilocin and LSD Approach the 5-HT2A Binding Pocket

Serotonergic psychedelics cross the blood-brain barrier and reach cortical neurons.

• 5-HT2A: Primary target (placeholder receptor subtype note)
• Tryptamine: Ligand class (placeholder chemical class note)
• ~20-40 min: Onset (placeholder timing note)
• Oral: Route (placeholder administration note)

Molecular diffusion and receptor approach

Placeholder: ligand crosses membrane and drifts toward receptor.

Binding pocket recognition

Placeholder: tryptamine scaffold matches orthosteric pocket residues.

Placeholder highlight: structural similarity to serotonin enables binding.

Conformational Activation of the 5-HT2A GPCR

Agonist binding triggers a conformational switch in the receptor.

• Gq/PLC: Signaling (placeholder pathway note)
• β-arrestin: Second path (placeholder bias note)
• IP3/DAG: Effect (placeholder cascade note)
• Layer V: Location (placeholder cortical layer note)

G-protein coupled activation

Placeholder: receptor recruits Gq protein and activates PLC.

Downstream second messengers

Placeholder: IP3 and DAG trigger calcium release in neuron.

Placeholder highlight: apical dendrite excitability rises sharply.

Layer V Pyramidal Neurons Become Hyperexcitable

Activated neurons fire more frequently and release more glutamate.

• ↑ Elevated: Firing rate (placeholder physiology note)
• ↑ Release: Glutamate (placeholder neurotransmitter note)
• Prefrontal: Cortex region (placeholder region note)
• ↓ Alpha power: EEG marker (placeholder EEG note)

Increased pyramidal firing

Placeholder: neurons cross threshold more often under agonism.

Network-wide desynchronization

Placeholder: cortical rhythms lose their usual synchrony.

Placeholder highlight: entropy of cortical signals increases measurably.

Default Mode Network Connectivity Loosens and Rewires

Hub regions of the default mode network lose their tight coupling.

• mPFC/PCC: DMN hubs (placeholder region note)
• ↓ Decreased: Connectivity (placeholder fMRI note)
• ↑ Integration: Cross-network (placeholder network note)
• fMRI/MEG: Measure (placeholder imaging note)

Hub decoupling

Placeholder: mPFC and PCC coupling weakens under agonism.

Emergent cross-network links

Placeholder: normally segregated networks begin to communicate.

Placeholder highlight: reduced DMN integrity correlates with ego dissolution.

Global Brain Dynamics Shift Toward an Entropic State

The whole-brain network becomes flatter, more flexible, less hierarchical.

• ↑ Increased: Entropy (placeholder dynamics note)
• Altered: Experience (placeholder subjective note)
• 4-8 hrs: Duration (placeholder duration note)
• REBUS: Model (placeholder theory note)

Relaxed belief hierarchies

Placeholder: top-down predictive control over cortex relaxes.

Subjective altered state

Placeholder: perception, mood, and self-referential thought change.

Placeholder highlight: effects resolve as receptors desensitize over hours.