Add comprehensive articles on Vascular Dementia and Wallerian Degeneration

- Created a detailed article for Vascular Dementia covering key facts, terminology, imaging findings, differential diagnoses, pathology, clinical issues, and diagnostic checklist. - Developed an extensive article on Wallerian Degeneration including key facts, terminology, imaging features, differential diagnoses, pathology, clinical issues, and diagnostic checklist.
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+---
+title: "Attention Control Network"
+docid: "a1bedda5-6478-40b2-98e7-6c5f5363b06f"
+breadcrumbs:
+  - "Brain"
+  - "Anatomy"
+  - "Brain Network Anatomy"
+  - "Attention Control Network"
+---
+# IMAGING ANATOMY
+
+- ## Overview
+  
+  
+    - Attention control network is a constellation of distributed brain networks processing attention to external stimuli and symbols
+          - Many aliases: Task-positive network, frontoparietal network, executive control network, and central executive network, each referring to subsets of the attention control network
+          - Terminology is not standard in the literature, and different authors use many of these terms interchangeably or to refer to different subsets of a broader attentional network
+- ## Dorsal Attention Network
+  
+  
+    - Function: Voluntary control of attentional focus and goal-directed behavior
+    - Regions: Intraparietal sulcus, frontal eye fields, middle temporal, dorsolateral prefrontal cortex
+          - Intraparietal sulcus
+                  - Weighting of sensory inputs: Direct control of relative "value" or "attention" to sensory stimuli
+                  - Topographically organized by stimulus modality and spatial location
+          - Frontal eye fields and supplementary eye fields
+                  - Control of direction of gaze to attentionally relevant stimuli
+          - Middle temporal (MT)
+                  - Motion perception, dynamic features of attention
+          - Dorsolateral prefrontal cortex (DLPFC)
+                  - Shared with ventral attention network, representations of objects and symbols, working memory
+- ## Ventral Attention Network
+  
+  
+    - Function: Control of reorienting to relevant stimuli, working memory
+    - Aliases: Frontoparietal control network, executive control network
+    - Regions: Supramarginal and angular gyri, inferior frontal gyrus, dorsolateral prefrontal cortex, ventral anterior cingulate cortex
+          - Inferior parietal lobule (supramarginal and angular gyri)
+          - Inferior frontal gyrus
+          - DLPFC
+          - Ventral anterior cingulate cortex
+- ## Salience Network
+  
+  
+    - Function: Detection of novel or salient stimuli
+    - Aliases: Novelty detection network, cingulo-opercular network
+    - Regions: Frontoinsula, dorsal anterior cingulate cortex
+          - Frontoinsula
+                  - "Sensory" arm of salience network
+                  - Mid superior insula: Detection of stimulus salience
+                  - Mid inferior insula: Detection of emotive salience
+                  - Anterior insula: Control of attention
+          - Dorsal anterior cingulate cortex
+                  - "Motor" arm of salience network
+                  - More anterior (pregenual) cingulate more associated with emotive salience, merges with ventral attention network
+
+# ANATOMY IMAGING ISSUES
+
+- ## Imaging Recommendations
+  
+  
+    - Specific subnetworks may be activated by specific tasks (e.g., oddball task for salience network, n-back task for dorsal attention network)
+- ## Imaging Pitfalls
+  
+  
+    - Many fMRI tasks have differential stimulus attention between active and control conditions
+          - Activation in attentional regions may not be task specific, but a general consequence of differential attention between conditions
+- ## Network Relationships
+  
+  
+    - Attention control network is anticorrelated to default mode network: When one is active, the other tends to be less active
+          - Allows focus of attention to shift between external and internal stimuli
+          - Gradients of anticorrelation across the attention control network are seen with specific subregions of each network hub showing greatest anticorrelation
+    - Attentional regions typically located in association cortex in regions spatially "equidistant" from primary sensory areas
+          - Flow of information from primary sensory to unimodal sensory association cortex to polymodal association cortex
+
+# CLINICAL IMPLICATIONS
+
+- ## Clinical Importance
+  
+  
+    - Right-dominant network for attention in most individuals
+          - Lesions of right ventral attention network may produce hemispatial neglect
+
+ 8145fc24-f946-49ef-9ae0-c4315a58d768