**📅 Date:** [[2024-12-13-Fri 〚🧠 Phase-Amplitude Coupling ▪ Fun Fact ▪ Synchronisation & Neurotherapeutics〛]] **👤 Who**：[[⍶N⍭⌭λ♅⟴⍭⌶]] **🗺️ Site**： #🌏/💻 #🌏/🏡 **💭Note:** #👾/Comment What if our brain is an instrument, capable of producing the most intricate symphony? And we, as the conductors and tuners, hold the power to fine-tune it to perform at its best harmony. ⇩ 🅻🅸🅽🅺🆂 ⇩ **🏷️ Tags**: #🧠/Neuro-Stimulation #🧠/Neuro-Science #🧠/Noun **🗂 Zett**: [[Neuro Oscillations（震荡）]] **📑 PDF**： [[Neuroscience - Brain Synchronisation and Neurotherapeutics 20241213.pdf]] **🌐 Link**: [Phase-amplitude coupling - BrainStorm Website](https://neuroimage.usc.edu/brainstorm/Tutorials/TutPac) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ## Phase-Amplitude Coupling (PAC) >[!definition] >**The coupling of the phase of slower electrophysiological oscillations with the amplitude of faster oscillations**, is thought to facilitate the dynamic integration of neural activity in the brain >This coupling plays a crucial role in brain function, communication, and cognitive processes. - ![[Phase-Amplitude Coupling 20241214213830.png|#left|300]] #### Also Called: **Nested Oscillations** The phase of the lower frequency oscillation (nesting) drives the power of the coupled higher frequency oscillation (nested), which results in the synchronisation of the amplitude envelope of faster rhythms with the phase of slower rhythms #### Example **Theta-Gamma Nested Oscillations**: - In the hippocampus, slow **theta waves (4–8 Hz)** modulate the activity of fast **gamma waves (30–100 Hz)**. - The theta wave provides an overall “time frame,” while the gamma wave fills it with detailed information for tasks like memory encoding or retrieval. ## Functions of Nested Oscillations #### 1. **Information Integration** - Nested oscillations allow different brain regions to synchronize and work together during tasks like ==perception, memory, or decision-making==.(嵌套振荡让不同的大脑区域在感知、记忆或决策等任务中能够同步并协同工作。) #### 2. **Memory Encoding and Retrieval** - In memory processes, theta waves serve as a “==timekeeper==,” while gamma waves deliver ==detailed content==, helping ==encode and retrieve information==.(在记忆过程中，θ波是“计时器”，而γ波提供具体内容，帮助编码和提取信息。) ### 3. **Attention and Cognition** - Nested oscillations help **prioritise and process information**, like focusing on important stimuli in a ==complex environment==. (嵌套振荡帮助优先处理信息，比如在复杂环境中专注于重要刺激。)