Post-encoding stress and spatial memory consolidation: No significant associations with cortisol and DHEA reactivity

Area of Science:

• Neuroscience
• Psychology
• Endocrinology

Background:

• Memory consolidation is influenced by stress hormones like cortisol.
• The role of dehydroepiandrosterone (DHEA) in stress-induced memory enhancement is not fully understood.

Purpose of the Study:

• To investigate the impact of the Maastricht Acute Stress Test (MAST) on psychological and hormonal responses.
• To examine the effect of MAST-induced stress on object-location memory (OLM) performance.
• To explore the association between hormonal reactivity and OLM task performance.

Main Methods:

• Fifty-four young adults were assigned to a stress or control group.
• Participants underwent an encoding trial for a virtual reality OLM task.
• The stress group performed the MAST, while the control group underwent a control procedure; hormonal levels (cortisol, DHEA) and psychological state were measured.

Main Results:

• The stress group reported higher anxiety and negative affect, perceiving the MAST as more stressful.
• Significant increases in salivary cortisol and DHEA were observed in the stress group post-MAST.
• Participants in the stress condition showed improved performance on certain aspects of the OLM task, including recognizing unrelated objects and faster object-context binding.

Conclusions:

• Post-encoding stress enhances memory consolidation, as evidenced by improved OLM task performance.
• Despite hormonal changes (cortisol, DHEA), no direct association was found between individual hormonal reactivity and the observed memory enhancements.
• These findings suggest that while stress benefits memory consolidation, the underlying hormonal mechanisms may not directly correlate with performance improvements.