BRIDGE CENTRALITY: IDENTIFYING BRIDGE SYMPTOMS IN PSYCHOPATHOLOGY - - PowerPoint PPT Presentation

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BRIDGE CENTRALITY: IDENTIFYING BRIDGE SYMPTOMS IN PSYCHOPATHOLOGY - - PowerPoint PPT Presentation

Oct 04, 2023 516 likes •849 views

BRIDGE CENTRALITY: IDENTIFYING BRIDGE SYMPTOMS IN PSYCHOPATHOLOGY NETWORKS Payton Jones Harvard University Masters Thesis Presentation Mental Disorder Comorbidity 1 6 3 4 7 8 2 9 5 10 Depression Social Anxiety Bridge Nodes 1

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BRIDGE CENTRALITY:

IDENTIFYING BRIDGE SYMPTOMS IN PSYCHOPATHOLOGY NETWORKS

Payton Jones

Harvard University Master’s Thesis Presentation

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Mental Disorder Comorbidity

Social Anxiety Depression

2 3 5 4 1 7 8 10 9 6

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2 3 5 4 1 7 8 10 9 6

Bridge Nodes

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Social Anxiety Depression

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CAN WE DETECT BRIDGE NODES IN COMPLEX NETWORKS?

MOTIVATING QUESTION:

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BRIDGE CENTRALITY

bridge expected influence bridge closeness bridge betweenness bridge strength

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2 3 5 4 1 7 8 10 9 6

Bridge Strength

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2 3 5 4 1 7 8 10 9 6

Bridge Betweenness

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2 3 5 4 1 7 8 10 9 6

Bridge Betweenness

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2 3 5 4 1 7 8 10 9 6

Bridge Closeness

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2 3 5 4 1 7 8 10 9 6

Bridge Expected Influence

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IS BRIDGE CENTRALITY ACCURATE?

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Study 1: Detection in simulations

Trials:

  • 1. Adding noise
  • 2. Adding causal direction
  • 3. Adding uncertainty about clusters

2 x 2 x 2 x 500 = 4,000 simulations

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Sensitivity Specificity

85% correct rejections 92% hits

8% misses 15% false alarms

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IS BRIDGE CENTRALITY USEFUL?

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Study 2: Simulation of contagion

  • 1. Start with one community

activated

  • 2. Allow the activation to spread
  • ver many iterations
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Study 2: Simulation of contagion

  • 1. Start with one community

activated

  • 2. Allow the activation to spread
  • ver many iterations
  • 3. Treat a limited number of

nodes

  • 4. Bridge centrality vs. previous

metrics

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Control 1 Control 2 Bridge Centrality

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DOES BRIDGE CENTRALITY WORK IN REAL LIFE SITUATIONS?

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  • 18 published networks
  • Bridge symptoms reported by researchers
  • Bridge symptoms indicated by bridge

centrality

RE-ANALYSIS:

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HOW CAN I USE BRIDGE CENTRALITY?

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BRIDGE CENTRALITY: BEYOND MENTAL DISORDERS?

  • Social Anxiety – Depression
  • Grief – Growth
  • Borderline Personality – Narcissistic Personality
  • State-Trait Anxiety – Neuroticism
  • Cognitive – Affective (Attitudes)
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  • network <- qgraph(cor(data),
  • graph=“glasso”,
  • sampleSize=1000)

GENERATE A NETWORK

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  • communities <- c(rep(“1”, 11), rep(“2”, 9))

DEFINE COMMUNITIES

1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2

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  • b <- bridge(network, communities)
  • plot(b, include=“Bridge Strength”)

BRIDGE CENTRALITY

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THANK YOU!

Read the preprint: https://osf.io/c5dkj/ Use the R package: networktools