Coffman, I., Resnick, H. E., Drane, J., & Lathan, C. E. (2017). Computerized cognitive testing norms in active-duty military personnel: Potential for contamination by psychologically unhealthy individuals. Applied Neuropsychology: Adult, 1-7.
Normative reference data used for clinical interpretation of neuropsychological testing results are only valid to the extent that the sample they are based on is composed of “normal” individuals. Accordingly, efforts are made to exclude individuals with histories and/or diagnoses that might bias test performance. In this report, we focus on these features in active-duty military personnel because published data on computerized neurocognitive testing norms for this population have not explicitly considered the consequences of neurobehavioral disorders (e.g., PTSD, depression), which are prevalent in this population and known to affect performance on some cognitive assessments. We administered DANA, a mobile, neurocognitive assessment tool, to a large sample of active-duty military personnel and found that scores on self-administered psychological assessments negatively impacted a number of neurocognitive tests. These results suggest that neurobehavioral disorders that are relatively common in this population should be controlled for when establishing normative datasets for neurocognitive outcomes.
Hollinger, K. R., Franke, C., Arenivas, A., Woods, S. R., Mealy, M. A., Levy, M., & Kaplin, A. I. (2016). Cognition, mood, and purpose in life in neuromyelitis optica spectrum disorder. Journal of the neurological sciences, 362, 85-90.
Background: Neuromyelitis optica (NMO) is a rare inflammatory disease of the central nervous system. Individuals with NMO often experience cognitive impairment and changes in mood.
Methods: Using the computerized defense automated neurobehavioral assessment (DANA) cognitive assessment battery, along with standard purpose in life (PIL) and depression (PHQ-9) tests, we studied the relationship between cognitive function, mood, and PIL in subjects with NMO (n=25) and healthy control (n=20) participants. Results: After controlling for age, gender, highest level of education, PHQ-9 score, and number of hours of sleep the previous night, NMO patients had a 13.8%-17.8% decrease in code substitution (CS) test performance compared to control subjects (p < 0.05). No significant differences were observed between groups in total PHQ-9 scores, but nearly 3x more NMO patients exhibited signs of mild, moderate or severe depression as compared to controls (58% vs 21%, respectively). Mood was not related to cognitive performance in either cohort. Opposing relationships between cognition and PIL were observed in NMO and control groups, with higher PIL associated with better cognition in NMO but worse cognition in controls.
Conclusions: Cognitive impairment is present in NMO, and the computerized DANA CS test is sensitive at detecting impairments. NMO patients with low PIL are more likely to be cognitively impaired than those with high PIL.
Lathan, Corinna, et al. “Defense Automated Neurobehavioral Assessment (DANA)-psychometric properties of a new field-deployable neurocognitive assessment tool.” Military medicine 178.4 (2013): 365-371.
The Defense Automated Neurobehavioral Assessment (DANA) is a new neurocognitive assessment tool that includes a library of standardized cognitive and psychological assessments, with three versions that range from a brief 5-minute screen to a 45-minute complete assessment. DANA is written using the Android open-source operating system and is suitable for multiple mobile platforms. This article presents testing of DANA by 224 active duty U.S. service members in five operationally relevant environments (desert, jungle, mountain, arctic, and shipboard). DANA was found to be a reliable instrument and compared favorably to other computer-based neurocognitive assessments. Implications for using DANA in far-forward military settings are discussed.
Lathan CE, Coffman I, Shewbridge R, Lee M, Cirio R, et al. A Pilot to Investigate the Feasibility of Mobile Cognitive Assessment of elderly patients and caregivers in the home. J Geriatrics Palliative Care 2016;4(1): 6.
Background: The number of older adults with Alzheimer’s disease (AD) has been steadily increasing and is likely to triple by 2050. Parallel increases in AD and informal AD caregivers who experience their own physical and cognitive challenges will result in the need for tools that can help both populations track their cognitive health easily, both in the clinic and at home.
Methods: DANA, a tablet-based, FDA-cleared computerized cognitive assessment tool, was used over 90 days among seven caregiver-AD patient dyads in-clinic and at home to assess DANA’s sensitivity in detecting mild cognitive impairment and dementia as well as its feasibility in the home and clinic.
Results: DANA is sensitive to certain differences in cognitive performance between AD patients and caregiver. Most subtests were found to be feasible for in-home use among both patients and caregivers.
Conclusion: DANA shows promise for use both in-clinic and in the home to track cognitive performance of AD patients and their caregivers.
Resnick HE, Lathan CE. From battlefield to home: a mobile platform for assessing brain health. mHealth 2016;2:30
Cognitive testing batteries have been used for decades to diagnose deficits associated with conditions such as head injury, age-related cognitive decline, and stroke, and they have also been used extensively for educational evaluation and planning. Cognitive testing is generally office-based, administered by professionals, uses paper and pencil testing modalities, reports results as summary scores, and is a “one shot deal” whose primary objective is to identify the presence and severity of cognitive deficit. This paper explores innovative departures from historical cognitive testing strategies and paradigms. The report explores (I) a shift from disease diagnosis in the office setting to mobile tracking of cognitive health and wellness in any setting; (II) the strength of computer-based cognitive measures and their role in facilitating development of new computational methods; and (III) using cognitive testing to inform on individual-level outcomes over time rather than dichotomous metrics at a single point in time.
Roach, Emma B., et al. “AltitudeOmics: Decreased reaction time after high altitude cognitive testing is a sensitive metric of hypoxic impairment.”NeuroReport 25.11 (2014): 814.
Humans experiencing hypoxic conditions exhibit multiple signs of cognitive impairment, and high altitude expeditions may be undermined by abrupt degradation in mental performance. Therefore, the development of psychometric tools to quickly and accurately assess cognitive impairment is of great importance in aiding medical decision-making in the field, particularly in situations where symptoms may not be readily recognized. The present study used the Defense Automated Neurobehavioral Assessment (DANA), a ruggedized and portable neurocognitive assessment tool, to examine cognitive function in healthy human volunteers at sea level, immediately after ascending to an elevation over 5000 m, and following 16 days of acclimatization to this high altitude. The DANA battery begins with a simple reaction time test (SRT1) which is followed by a 20-min series of complex cognitive tests and ends with a second test of simple reaction time (SRT2). Tabulating the performance scores from these two tests allows the calculation of an SRT change score (dSRT =SRT1–SRT2) that reflects the potential effect of mental effort spent during the 20-min testing session. We found that dSRT, but not direct SRT in comparison to sea-level baseline performance, is highly sensitive to acute altitude-related performance deficits and the remission of impairment following successful acclimatization. Our results suggest that dSRT is a potentially useful analytical method to enhance the sensitivity of neurocognitive assessment.
Russo, C. R., and C. E. Lathan. “An Evaluation of the Consistency and Reliability of the Defense Automated Neurocognitive Assessment Tool.” Applied Psychological Measurement (2015): 0146621615577361
A durable, portable, and field-hardened computerized neurocognitive test (CNT) called the Defense Automated Neurobehavioral Assessment (DANA) tool was recently developed to provide a practical means to conduct neurological and psychological assessment in situ. The psychometric properties of the DANA have been previously described. This present work discusses the test–retest reliability of the DANA Rapid test battery, as administered to a homogeneous population of U.S. Air Force Academy football team players (N = 162) across the duration of the season. The intraclass correlation coefficient (ICC) metric of the DANA is compared with that from two different CNTs recently reported in Cole et al., and the implications of using the metric to interpret comparative test reliability among different CNTs are discussed.
Spira, James L., et al. “The Impact of Multiple Concussions on Emotional Distress, Post-Concussive Symptoms, and Neurocognitive Functioning in Active Duty United States Marines Independent of Combat Exposure or Emotional Distress.” Journal of neurotrauma 31.22 (2014): 1823-1834.
Controversy exists as to whether the lingering effects of concussion on emotional, physical, and cognitive symptoms is because of the effects of brain trauma or purely to emotional factors such as post-traumatic stress disorder or depression. This study examines the independent effects of concussion on persistent symptoms. The Defense Automated Neurobehavioral Assessment, a clinical decision support tool, was used to assess neurobehavioral functioning in 646 United States Marines, all of whom were fit for duty. Marines were assessed for concussion history, post-concussive symptoms,emotional distress, neurocognitive functioning, and deployment history. Results showed that a recent concussion or ever having experienced a concussion was associated with an increase in emotional distress, but not with persistent post concussive symptoms (PPCS) or neurocognitive functioning. Having had multiple lifetime concussions, however, was associated with greater emotional distress, PPCS, and reduced neurocognitive functioning that needs attention and rapid discrimination, but not for memory-based tasks. These results are independent of deployment history, combat exposure, and symptoms of post-traumatic stress disorder and depression. Results supported earlier findings that a previous concussion is not generally associated with post-concussive symptoms independent of covariates. In contrast with other studies that failed to find a unique contribution for concussion to PPCS, however, evidence of recent and multiple concussion was seen across a range of emotional distress, post-concussive symptoms, and neurocognitive functioning in this study population. Results are discussed in terms of implications for assessing concussion on return from combat.
Subudhi, Andrew W., et al. “AltitudeOmics: the integrative physiology of human acclimatization to hypobaric hypoxia and its retention upon reascent.” PloS one9.3 (2014): e92191.
An understanding of human responses to hypoxia is important for the health of millions of people worldwide who visit, live, or work in the hypoxic environment encountered at high altitudes. In spite of dozens of studies over the last 100 years, the basic mechanisms controlling acclimatization to hypoxia remain largely unknown. The AltitudeOmics project aimed to bridge this gap. Our goals were 1) to describe a phenotype for successful acclimatization and assess its retention and 2) use these findings as a foundation for companion mechanistic studies. Our approach was to characterize acclimatization by measuring changes in arterial oxygenation and hemoglobin concentration [Hb], acute mountain sickness (AMS), cognitive function, and exercise performance in 21 subjects as they acclimatized to 5260 m over 16 days. We then focused on the retention of acclimatization by having subjects reascend to 5260 m after either 7 (n = 14) or 21 (n = 7) days at 1525 m. At 16 days at 5260 m we observed: 1) increases in arterial oxygenation and [Hb] (compared to acute hypoxia: PaO2 rose 964 mmHg to 4564 while PaCO2 dropped a further 663 mmHg to 2163, and [Hb] rose 1.860.7 g/dL to 1662 g/dL; 2) no AMS; 3) improved cognitive function; and 4) improved exercise performance by 868% (all changes p,0.01). Upon renascent,we observed retention of arterial oxygenation but not [Hb], protection from AMS, retention of exercise performance, less retention of cognitive function; and noted that some of these effects lasted for 21 days. Taken together, these findings reveal new information about retention of acclimatization, and can be used as a physiological foundation to explore the molecular mechanisms of acclimatization and its retention.
Spira, J.L., King, L.A., Lathan, C., Tsao, J. (2014, August). Development of an Objective, Functional Biomarker of Invisible Wounds of War for Use by Providers. Poster session presented at the Military Health System Research Symposium, Fort Lauderdale, FL.
Eonta, S.E., Paech, G.M., Banks, S., Johnson, K., Vedova, C.D., Kamimori, G.H. (August, 2014). Impact of Caffeine on Neurocognitive Performance During Sleep Deprivations Using the Defense Automated Neurobehavioral Assessment (DANA). Poster session presented at the Military Health Systems Research Symposium, Ft. Lauderdale, FL
Kamimori, G.H., LaValle, C., Paech, G., Johnson, K., Banks S., Dark, H., & Eonta, S. (August, 2015). “Performance on the Defense Automated Neurobehavioral Assessment Battery (DANA) and simulated driving performance over 50h of continuous wakefulness: Correlation between Neurocognitive and Operational Performance (#2003),” Poster session presented at the Military Health Systems Research Symposium, Ft. Lauderdale, FL