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TEST DATA ANALYSIS Presented by The National Center for Credibility Assessment

TEST DATA ANALYSIS Presented by The National Center for Credibility Assessment. April 2011. OBJECTIVES. Identify and discuss 12 current diagnostic features used in evaluating data for all three physiological waveforms: Respiration Five RLL features One non-RLL feature.

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TEST DATA ANALYSIS Presented by The National Center for Credibility Assessment

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  1. TEST DATA ANALYSISPresented byThe National Center forCredibility Assessment April 2011

  2. OBJECTIVES • Identify and discuss 12 current diagnostic features used in evaluating data for all three physiological waveforms: • Respiration • Five RLL features • One non-RLL feature

  3. OBJECTIVESDiagnostic Features • Electrodermal Activity (EDA) • One primary feature • Two secondary features • Cardiovascular • One primary feature • Two secondary features

  4. OBJECTIVES • Review current scoring procedures for each physiological waveform using 3 & 7 position numerical scales

  5. HISTORICAL PERSPECTIVE • In 2002-2003, Mr. Don Krapohl and Dr Stuart Senter, NCCA Research Division, accomplished extensive literature review to determine how many of the 20 diagnostic features (at that time) could be validated through research

  6. HISTORICAL PERSPECTIVE • Their exhaustive review indicated 12 diagnostic features could be supported by replicated research: • Respiration (6 features): • RLL: Apnea-blocking, suppression, progressive decrease in amplitude, decrease in rate and change in I/E ratio • Non-RLL: Temporary increase in baseline

  7. HISTORICAL PERSPECTIVE • Krapohl & Senter’s research (cont’d): • Electrodermal activity (EDA) (3 features): • EDA amplitude • EDA complexity • EDA duration • Cardiovascular (3 features): • Baseline arousal (phasic response) • Duration • Decrease in rate (pulse rate deceleration)

  8. HISTORICAL PERSPECTIVE • On 23 Aug 2006, extensive changes were incorporated into NCCA’s curriculum

  9. RESPIRATORY SYSTEM

  10. RESPIRATORY WAVEFORM • Typically, the normal resting cyclic rate is 12 to 18 breaths per minute. However, this rate may vary due to a person's physical attributes and/or physical conditioning.

  11. RESPIRATORY WAVEFORM • Respiratory changes may be considered responses when occurring in a timely manner to an applied stimulus (reviewed test question) and • There is no excessive noise on the signal of interest at stimulus onset

  12. RESPIRATORY WAVEFORM • What is considered a timely response in the respiratory tracing? • Should occur within Response Onset Window (ROW): • Stimulus onset to include first complete respiratory cycle past answer cycle

  13. RESPIRATORY WAVEFORM Response Onset Window

  14. RESPIRATORY WAVEFORM • Five respiration line length (RLL) diagnostic features: • Apnea - blocking • Decrease in rate • Change in I/E ratio • Decrease in amplitude • Progressive decrease in amplitude

  15. RESPIRATORY WAVEFORMWhat is RLL? • Respiration Line Length (RLL): Procedure for analysis of respiratory tracings. • RLL is determined by taking response for specified period of time and visually stretching response into straight line. • NCCA utilizes equivalent response window of evaluation

  16. RESPIRATION LINE LENGTH • In RLL procedure, shorter line length signifies more intense or significant response and will be assigned numerical value.

  17. RESPIRATORY WAVEFORMRLL Window of Evaluation 20 Seconds Value = +1 Value = +1 Default Window of Evaluation

  18. RESPIRATORY WAVEFORM • RLL diagnostic features

  19. RESPIRATORY WAVEFORM Feature 1: Apnea-Blocking (Suppression) l l - Notes: 1. Feature occurs near end of exhalation portion of respiratory cycle. 2. Apnea-blocking feature does not drop significantly below established baseline

  20. RESPIRATORY WAVEFORM • Feature 2: Decrease in Rate l l -

  21. RESPIRATORY WAVEFORM • Feature 3: Change in I/E Ratio l l -

  22. RESPIRATORY WAVEFORM • Feature 4: Decrease in Amplitude • (Suppression) l l -

  23. RESPIRATORY WAVEFORM • Feature 5: Progressive Decrease in Amplitude (Suppression) l l -

  24. RESPIRATORY WAVEFORMEvaluation Procedures • If RLL applies to all comparative responses in same analysis spot: • Determine response window of evaluation • Window of evaluation defaults to response having most duration in analysis spot

  25. Establishing Window of Evaluation 12 Seconds 20 Seconds Default Window of Evaluation

  26. RESPIRATORY WAVEFORMEvaluation Procedures • Time for defaulted window of evaluation is from response onset to response end

  27. RESPIRATORY WAVEFORMEvaluation Procedures • Equivalent window of evaluation used for all other comparative responses in same analysis spot • Variable window for each analysis spot

  28. RESPIRATION LINE LENGTH • In RLL procedure, when data is visually stretched, shorter line length signifies more intense or significant response and will be assigned numerical value.

  29. RESPIRATORY WAVEFORM SCORING EXERCISE

  30. RESPIRATORY WAVEFORM Score C1 Against R1 & R2 Score = +1 Score = +1

  31. RESIRATORY WAVEFORM Score C1 Against R1 & R2 Score = -1 Score = -1

  32. RESPIRATORY WAVEFORMScore C2 against R1 Score = -1

  33. RESPIRATORY WAVEFORMScore C1 against R1 Score = -1

  34. RESPIRATORY WAVEFORM • One non-RLL feature remains: • Temporary increase in baseline

  35. RESPIRATORY WAVEFORM Feature 6: Temporary Increase in Baseline l l -

  36. TEMPORARY INCREASE IN BASELINE Value = +1

  37. RESPIRATORY WAVEFORMEvaluation Procedures • If one comparative response in analysis spot is RLL and other is non-RLL, RLL responsealways gets value • RLL features in analysis spot always take precedent over non-RLL feature in same analysis spot

  38. RESPIRATORY WAVEFORM Score C4 Against R5 Non-RLL RLL Value = +1

  39. Respiratory Waveform Non-RLL Evaluation Procedures • In scoring non-RLL responses, most significant response will get assigned value. Significance is generally determined by the duration of the physiological change

  40. Respiratory Waveform Score C4 Against R5? 11 Seconds 15 Seconds Value = -1

  41. TEMPORARY INCREASE IN BASELINE Value = +1

  42. Respiratory WaveformNon-RLL Diagnostic Feature • Temporary Increase in Baseline • Could easily become RLL feature if suppression occurs with baseline change • If so, RLL scoring procedures apply

  43. Temporary Increase in Baseline & Decrease in Amplitude

  44. RESPIRATORY WAVEFORM Other Considerations • May see exaggerated respiratory cycle in/around answer cycle • May be exhibited many forms • One cycle of “something is nothing” principle

  45. RESPIRATORY WAVEFORM One Cycle of Something Is Nothing

  46. RESPIRATORY WAVEFORM Other Considerations • Respiratory channel is often called “effector” • What occurs in respiratory channel has tendency to influence other channels • Artifact in respiratory channel may effect ability to evaluate EDA and cardiovascular channels

  47. ELECTRODERMAL CHANNNEL

  48. ELECTRODERMAL WAVEFORM • Two types of tracings are skin resistance (SR) and skin conductance (SC). • The electrodermal (EDA) waveform consists of a relatively horizontal tracing indicative of the level of the electrical resistance/ conductance in the skin due to skin hydration. No stimulus applied

  49. ELECTRODERMAL WAVEFORM Response Onset Window

  50. ELECTRODERMAL WAVEFORM • One primary diagnostic feature • Amplitude • Two Secondary diagnostic features • Complexity • Duration

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