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September 18, 2026Journal of Cerebral Blood Flow & Metabolism

Visual gamma stimulation enhances 0.2-0.4Hz blood flow oscillations by ~38% versus control in healthy mice.

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Why the study?

Does 40Hz visual flicker (GENUS) improve low-frequency blood flow oscillations in healthy mice?

Population

Head-fixed, awake healthy C57Bl/6 mice (n=18; 9 male, 9 female) aged between 18 to 60 weeks.

Comparison

White light of 40Hz visual flicker for 1 hour. vs Constant stimulus (control) white light.

Design

Preclinical

Follow-up

30 minutes after stimulation

Key result

Visual gamma stimulation (GENUS) enhanced the magnitude of 0.2-0.4Hz blood flow oscillations by 38% during stimulation and by 30% at 30 minutes post-stimulation compared to control in healthy mice.

Authors

PBPiergiulio BressanELEmily A LongJJJohn Jiang

Discussion

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Overview

Should not yet inform clinical practice; leaves open whether GENUS modulates vasomotion beyond healthy mice.

Key Points

  • To evaluate the effect of 40Hz visual gamma sensory entrainment on low-frequency vascular oscillations and vasomotion across cortical regions in healthy mice.
  • Exposed awake, head-fixed C57Bl/6 mice (N=18; 9 males, 9 females; aged 18–60 weeks) to 1 hour of either 40Hz visual flicker (GENUS) or constant white light control.
  • Monitored cortical blood flow using laser speckle contrast imaging before, during, immediately after, and 30 minutes post-stimulation, evaluated using a linear mixed-effects model adjusting for age and sex.
  • GENUS enhanced the magnitude of 0.2–0.4Hz low-frequency blood flow oscillations by 38% during stimulation compared to control.
  • Oscillatory enhancement persisted after exposure, showing a 30% increase over control at 30 minutes post-stimulation across widespread superficial cortical areas beyond visual regions.

Structured PICO

Does 40Hz visual flicker (GENUS) improve low-frequency blood flow oscillations in healthy mice?

P
Population
18 healthy, awake C57Bl/6 mice (50% female) aged 18 to 60 weeks subjected to visual stimulation.
I
Intervention
White light of 40Hz visual flicker (Gamma entrainment using sensory stimuli - GENUS) for 1 hour.
C
Comparator
Constant stimulus (control) white light.
O
Outcome
Magnitude of 0.2-0.4Hz blood flow oscillations measured using laser speckle contrast imaging (LSCI) before, during, immediately after 1 hour of stimulus, and 30 minutes after stimulus termination.surrogate

Main Result

Effect estimate: 38% increase

Visual gamma stimulation (40Hz) enhances low-frequency blood flow oscillations across superficial cortical regions in mice, suggesting a potential mechanism for increasing vasomotion in therapeutic contexts.

Cite This Study

Bressan et al. (2026) studied Healthy (n=18). 40Hz visual flicker (GENUS) vs. Constant stimulus (control) was evaluated on Magnitude of 0.2-0.4Hz blood flow oscillations (38% increase). Visual gamma stimulation (GENUS) enhanced the magnitude of 0.2-0.4Hz blood flow oscillations by 38% during stimulation and by 30% at 30 minutes post-stimulation compared to control in healthy mice.

synapsesocial.com/papers/6aacf5ed0c46fbdff987dd6bhttps://doi.org/10.1177/0271678x261492627
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