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Reentrainment Impairs Spatial Working Memory until Both Activity Onset and Offset Reentrain.

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Circadian rhythm active phase (α) compression impairs spatial working memory during reentrainment. Memory function recovers once the active phase decompresses to baseline levels.

Keywords:
alphabiomarkercircadianjet lagphase shiftsex differencesshift workspontaneous alternation

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Area of Science:

  • Chronobiology
  • Neuroscience

Background:

  • Circadian rhythms regulate physiological processes, including sleep-wake cycles and behavior.
  • Active phase (α) compression during reentrainment to light-dark cycles is common but its functional impact is unknown.

Purpose of the Study:

  • To investigate the functional consequences of active phase (α) compression on spatial working memory.
  • To assess if α compression impairs spontaneous alternation (SA) behavior in Siberian hamsters.

Main Methods:

  • Animals were exposed to phase-shifted light-dark cycles or light pulses to induce α compression.
  • Spatial working memory was assessed using spontaneous alternation (SA) behavior in a T-maze.
  • Active phase (α) duration was quantified during and after compression.

Main Results:

  • Spatial working memory, assessed by SA, was impaired during α decompression following phase shifts.
  • SA behavior improved as α returned to baseline levels.
  • Light pulses compressing α also impaired SA behavior until α decompressed.

Conclusions:

  • The dynamic process of active phase (α) compression and decompression negatively impacts spatial working memory.
  • Active phase modulation may serve as a biomarker for memory deficits associated with circadian disruption, such as from shift work or transmeridian travel.