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@@ -9,14 +9,11 @@ This framework describes a system that is not a static processor, but a living e
### Pillar 1: The Electrical Pillar (The Integration Layer) ### Pillar 1: The Electrical Pillar (The Integration Layer)
- Function & Reason: Pattern Extraction. The neuron acts as a spatiotemporal filter. It integrates thousands of tiny inputs across its dendritic tree (space) and within narrow windows of time. Its "output" is a declaration that a specific relevant pattern has been recognized. - Function & Reason: Pattern Extraction. The neuron acts as a spatiotemporal filter. It integrates thousands of tiny inputs across its dendritic tree (space) and within narrow windows of time. Its "output" is a declaration that a specific relevant pattern has been recognized.
- Timescale: Milliseconds (ms). - Timescale: Milliseconds (ms).
- Behaviors: Summation of Excitatory/Inhibitory Post-Synaptic Potentials (EPSPs/IPSPs), the "Tug-of-War" at the soma, and the propagation of the "Success" signal (the Spike). - Behaviors: Summation of Excitatory/Inhibitory Post-Synaptic Potentials (EPSPs/IPSPs), the "Tug-of-War" at the soma, and the propagation of the "Success" signal (the Spike).
- Elements Involved: - Elements Involved:
-- Ions: Na+ (The "Yes" current), K+ (The "No/Reset" current). \-- Ions: Na+ (The "Yes" current), K+ (The "No/Reset" current).
-- Hardware: Dendritic tree (The Space), VGSC/VGKC (The Timers). \-- Hardware: Dendritic tree (The Space), VGSC/VGKC (The Timers).
### Pillar 2: The Metabolic Pillar (The Constraint Layer) ### Pillar 2: The Metabolic Pillar (The Constraint Layer)
@@ -24,9 +21,9 @@ This framework describes a system that is not a static processor, but a living e
* **Timescale:** **Seconds to Minutes.** * **Timescale:** **Seconds to Minutes.**
* **Behaviors:** Active transport of ions, ATP production, and "Metabolic Silencing" (shutting down to prevent death when energy is low). * **Behaviors:** Active transport of ions, ATP production, and "Metabolic Silencing" (shutting down to prevent death when energy is low).
* **Elements Involved:** * **Elements Involved:**
* **Molecules:** ATP, Glucose, Oxygen. * **Molecules:** ATP, Glucose, Oxygen.
* **Hardware:** Na/K-ATPase Pump (the "Battery Recharger"), Mitochondria. * **Hardware:** Na/K-ATPase Pump (the "Battery Recharger"), Mitochondria.
* **Constraint:** The $Na^+/K^+$ ratio. * **Constraint:** The $Na^+/K^+$ ratio.
### Pillar 3: The Calcium Pillar (The Logic / Information Keeper) ### Pillar 3: The Calcium Pillar (The Logic / Information Keeper)
@@ -34,9 +31,9 @@ This framework describes a system that is not a static processor, but a living e
* **Timescale:** **Minutes to Hours.** * **Timescale:** **Minutes to Hours.**
* **Behaviors:** **Homeostatic Scaling** (tuning the master volume), Synaptic Plasticity (LTP/LTD), and Gain Control. * **Behaviors:** **Homeostatic Scaling** (tuning the master volume), Synaptic Plasticity (LTP/LTD), and Gain Control.
* **Elements Involved:** * **Elements Involved:**
* **Ions:** Calcium ($Ca^{2+}$). * **Ions:** Calcium ($Ca^{2+}$).
* **Hardware:** Somatic VGCCs (L-type), NMDA receptors. * **Hardware:** Somatic VGCCs (L-type), NMDA receptors.
* **Software:** Calmodulin, CaMKIV (signaling proteins that "count" the calcium). * **Software:** Calmodulin, CaMKIV (signaling proteins that "count" the calcium).
### Pillar 4: The Structural Pillar (The Renovation Layer) ### Pillar 4: The Structural Pillar (The Renovation Layer)
@@ -44,24 +41,22 @@ This framework describes a system that is not a static processor, but a living e
* **Timescale:** **Days to Weeks.** * **Timescale:** **Days to Weeks.**
* **Behaviors:** **Axon Initial Segment (AIS) translocation** (moving the trigger zone), dendritic branch growth/pruning, and changes in total channel/receptor count via gene expression. * **Behaviors:** **Axon Initial Segment (AIS) translocation** (moving the trigger zone), dendritic branch growth/pruning, and changes in total channel/receptor count via gene expression.
* **Elements Involved:** * **Elements Involved:**
* **Structural Proteins:** Actin, Microtubules, Ankyrin-G (the "anchor"). * **Structural Proteins:** Actin, Microtubules, Ankyrin-G (the "anchor").
* **Genetics:** mRNA, Ribosomes, Transcription Factors (e.g., CREB). * **Genetics:** mRNA, Ribosomes, Transcription Factors (e.g., CREB).
### What is Achieved by This Entity? ### What is Achieved by This Entity?
By combining these four pillars, the neuron becomes a Non-Static Adaptive Engine: By combining these four pillars, the neuron becomes a Non-Static Adaptive Engine:
- Selective Attention: It doesn't just pass signals; it ignores noise and only "speaks" when its specific spatial and temporal requirements are met. - Selective Attention: It doesn't just pass signals; it ignores noise and only "speaks" when its specific spatial and temporal requirements are met.
- Self-Regulating Sensitivity: If the patterns it is expecting become too frequent or too rare, the Calcium and Structural pillars adjust the Electrical hardware to find a new "sweet spot." - Self-Regulating Sensitivity: If the patterns it is expecting become too frequent or too rare, the Calcium and Structural pillars adjust the Electrical hardware to find a new "sweet spot."
- Metabolic Wisdom: It balances the "desire" to extract patterns against the "cost" of ATP. It is an engine that tunes itself to be as efficient as possible. - Metabolic Wisdom: It balances the "desire" to extract patterns against the "cost" of ATP. It is an engine that tunes itself to be as efficient as possible.
- Hardware-Software Unity: Unlike a computer, where the software cannot change the CPU, the neuron's "software" (the activity patterns) physically rewrites its "hardware" (the pillars) every single day. - Hardware-Software Unity: Unlike a computer, where the software cannot change the CPU, the neuron's "software" (the activity patterns) physically rewrites its "hardware" (the pillars) every single day.
This is the portrait of a system that isn't just "running a program"—it is a biological machine constantly sculpting itself to become a better filter for the world it perceives. This is the portrait of a system that isn't just "running a program"—it is a biological machine constantly sculpting itself to become a better filter for the world it perceives.
--- ---
--- ---
## Flussi e chiusure ## Flussi e chiusure
@@ -69,15 +64,10 @@ This is the portrait of a system that isn't just "running a program"—it is a b
### Flusso da POST a SOMA ### Flusso da POST a SOMA
- Gli NT che arrivano a BEH-POST-AMPA aprono i AMPA che fa entrare Na che vengono integrati nella POST - Gli NT che arrivano a BEH-POST-AMPA aprono i AMPA che fa entrare Na che vengono integrati nella POST
- Gli Na nella POST aprono NDMA che fanno entrare Ca2+ - Gli Na nella POST aprono NDMA che fanno entrare Ca2+
- Ca2+ genera VPost nel DB - Ca2+ genera VPost nel DB
- L'integrazione di VPost nel DB genera VDB nel SOMA - L'integrazione di VPost nel DB genera VDB nel SOMA
- L'integrazione di VDB nel SOMA determina AP - L'integrazione di VDB nel SOMA determina AP
- Si aprono i Canali ionici del SOMA, si genera VSOMA e refractory period (emergente) - Si aprono i Canali ionici del SOMA, si genera VSOMA e refractory period (emergente)
### Flusso da SOMA a POST ### Flusso da SOMA a POST
@@ -94,8 +84,8 @@ Based on the computational model provided, here is the complete breakdown of all
### 1. Presynaptic Behaviors ### 1. Presynaptic Behaviors
* **Action Potential Arrival (`V_pre`):** When a spike occurs, the membrane potential (`V_pre_state`) jumps to a peak and decays based on `tau_V_pre`. This profile determines the duration of ion channel opening. * **Action Potential Arrival (**`V_pre`**):** When a spike occurs, the membrane potential (`V_pre_state`) jumps to a peak and decays based on `tau_V_pre`. This profile determines the duration of ion channel opening.
* **Calcium Influx (`VGCC`):** Voltage-Gated Calcium Channels open based on `V_pre_state`. The flow is regulated by three "brakes": **eCB** (retrograde), **CDI** (inactivation), and **mGluR** (autoreceptor). * **Calcium Influx (**`VGCC`**):** Voltage-Gated Calcium Channels open based on `V_pre_state`. The flow is regulated by three "brakes": **eCB** (retrograde), **CDI** (inactivation), and **mGluR** (autoreceptor).
* **Intracellular Buffering:** Free calcium (`Ca_micro`) is immediately captured by buffers (`B_free`). As activity increases and buffers saturate, the effective calcium concentration rises faster (**Metabolic Cascade 4**). * **Intracellular Buffering:** Free calcium (`Ca_micro`) is immediately captured by buffers (`B_free`). As activity increases and buffers saturate, the effective calcium concentration rises faster (**Metabolic Cascade 4**).
* **Vesicle Release (NT):** Neurotransmitter release is **deterministic** and follows a Hill equation (simulating Synaptotagmin-1 cooperativity). It is limited by the number of vesicles in the Prontly Releasable Pool (`N_RRP`) and suppressed by high existing levels of NT in the cleft. * **Vesicle Release (NT):** Neurotransmitter release is **deterministic** and follows a Hill equation (simulating Synaptotagmin-1 cooperativity). It is limited by the number of vesicles in the Prontly Releasable Pool (`N_RRP`) and suppressed by high existing levels of NT in the cleft.
* **Vesicle Recycling:** Vesicles move from the Reserve Pool (`N_RP`) to the `N_RRP` at a rate determined by the calcium trace (`Tr_Ca`). Fast recruitment occurs during high activity; slow recruitment occurs at rest. * **Vesicle Recycling:** Vesicles move from the Reserve Pool (`N_RP`) to the `N_RRP` at a rate determined by the calcium trace (`Tr_Ca`). Fast recruitment occurs during high activity; slow recruitment occurs at rest.
@@ -118,9 +108,9 @@ Based on the computational model provided, here is the complete breakdown of all
* **Leaky Integration:** The soma integrates the signal from the dendrite (`V_dend`) scaled by `soma_weight`. It acts as a leaky integrator with a time constant of `tau_soma`. * **Leaky Integration:** The soma integrates the signal from the dendrite (`V_dend`) scaled by `soma_weight`. It acts as a leaky integrator with a time constant of `tau_soma`.
* **Action Potential (AP) Generation:** If `V_soma` crosses the threshold, a multi-phase AP is triggered: * **Action Potential (AP) Generation:** If `V_soma` crosses the threshold, a multi-phase AP is triggered:
1. **Rising Phase:** Simulated Na+ channel opening (reaches `V_AP_peak`). 1. **Rising Phase:** Simulated Na+ channel opening (reaches `V_AP_peak`).
2. **Falling Phase:** Simulated K+ channel opening (drops to `V_AHP`). 2. **Falling Phase:** Simulated K+ channel opening (drops to `V_AHP`).
3. **AHP Phase:** Recovery from hyperpolarization back to rest. 3. **AHP Phase:** Recovery from hyperpolarization back to rest.
* **Refractory Periods:** After firing, the soma enters an **Absolute Refractory Period** (cannot fire) followed by a **Relative Refractory Period** (threshold is temporarily much higher). * **Refractory Periods:** After firing, the soma enters an **Absolute Refractory Period** (cannot fire) followed by a **Relative Refractory Period** (threshold is temporarily much higher).
### 5. Astrocytic Behaviors ### 5. Astrocytic Behaviors
@@ -140,10 +130,10 @@ Based on the computational model provided, here is the complete breakdown of all
### Logic Summary Table ### Logic Summary Table
| Input | Process | Output | | Input | Process | Output |
| :--- | :--- | :--- | |------------------------|---------------------|-------------------------------------|
| **NT in Cleft** | AMPA / NMDA Opening | **V_post** (Postsynaptic Potential) | | **NT in Cleft** | AMPA / NMDA Opening | **V_post** (Postsynaptic Potential) |
| **V_post** | Dendritic Summation | **V_dend** (Dendritic Potential) | | **V_post** | Dendritic Summation | **V_dend** (Dendritic Potential) |
| **V_dend** | Somatic Integration | **V_soma** (Somatic Potential) | | **V_dend** | Somatic Integration | **V_soma** (Somatic Potential) |
| **V_soma > Threshold** | Spike Kinetics | **Forward AP** & **Retrograde bAP** | | **V_soma > Threshold** | Spike Kinetics | **Forward AP** & **Retrograde bAP** |
| **Low ATP** | Pump Failure | **Synaptic Silencing** (Protection) | | **Low ATP** | Pump Failure | **Synaptic Silencing** (Protection) |