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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Performance-Based Differences in Prefrontal Cortex Activation: Assessing Dynamic Marksmanship Performance Using

Owen F Salmon1, Thomas X Statz1, Cierra B Ugale1

  • 1Robbins College of Health and Human Sciences, Human & Environmental Physiology Laboratory, Department of Health, Human Performance and Recreation, Baylor University, Waco, TX.

Journal of Special Operations Medicine : a Peer Reviewed Journal for SOF Medical Professionals
|May 24, 2025
PubMed
Summary
This summary is machine-generated.

Neuroimaging reveals that less proficient marksmen experience higher prefrontal cortex (PFC) activation, indicating increased cognitive load during marksmanship tasks. This finding may inform training for enhanced stress resilience and mission readiness.

Keywords:
cerebral hemodynamicsfunctional near-infrared spectroscopymarksmanshipmilitarymotor skillspsychomotor performancetask performance and analysis

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Military Science

Background:

  • Marksmanship is a critical skill for military personnel.
  • Neurophysiological differences underlying marksmanship performance are not well understood.
  • Functional near-infrared spectroscopy (fNIRS) can track prefrontal cortex (PFC) activation.

Purpose of the Study:

  • To investigate cognitive load differences in the PFC between proficient and non-proficient marksmen during a simulated dynamic marksmanship task.
  • To utilize fNIRS to measure PFC hemodynamic activity.

Main Methods:

  • Twenty-four participants (12 proficient, 12 non-proficient) performed a simulated dynamic shoot/no-shoot course of fire.
  • fNIRS monitored relative concentrations of oxyhemoglobin (HbO2) and total hemoglobin (total Hb) in the PFC.
  • Proficiency was determined by performance on a stationary pistol task.

Main Results:

  • No significant difference in task completion time between groups.
  • Non-proficient marksmen exhibited significantly higher HbO2 (26.3%) and total Hb (42.1%) in the PFC compared to proficient marksmen.
  • These results suggest greater cognitive load in less proficient individuals.

Conclusions:

  • PFC hemodynamic activity, measured by fNIRS, can differentiate marksmen based on proficiency.
  • Increased PFC activation in non-proficient marksmen indicates higher cognitive load during dynamic tasks.
  • fNIRS application in marksmanship training may enhance stress resilience and mission readiness.