Scholars@Duke
Alex Vaz
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Selected Publications

Backbone spiking sequence as a basis for preplay, replay, and default states in human cortex.

Journal Article Nat Commun · August 7, 2023 Sequences of spiking activity have been heavily implicated as potential substrates of memory formation and retrieval across many species. A parallel line of recent evidence also asserts that sequential activity may arise from and be constrained by pre-exis ... Full text Link to item Cite

Replay of cortical spiking sequences during human memory retrieval.

Journal Article Science · March 6, 2020 Episodic memory retrieval is thought to rely on the replay of past experiences, yet it remains unknown how human single-unit activity is temporally organized during episodic memory encoding and retrieval. We found that ripple oscillations in the human cort ... Full text Link to item Cite

Efficient tandem solar cells with solution-processed perovskite on textured crystalline silicon.

Journal Article Science · March 6, 2020 Stacking solar cells with decreasing band gaps to form tandems presents the possibility of overcoming the single-junction Shockley-Queisser limit in photovoltaics. The rapid development of solution-processed perovskites has brought perovskite single-juncti ... Full text Link to item Cite

Coupled ripple oscillations between the medial temporal lobe and neocortex retrieve human memory.

Journal Article Science · March 1, 2019 Episodic memory retrieval relies on the recovery of neural representations of waking experience. This process is thought to involve a communication dynamic between the medial temporal lobe memory system and the neocortex. How this occurs is largely unknown ... Full text Open Access Link to item Cite

Dual origins of measured phase-amplitude coupling reveal distinct neural mechanisms underlying episodic memory in the human cortex.

Journal Article Neuroimage · March 1, 2017 Phase-amplitude coupling (PAC) is hypothesized to coordinate neural activity, but its role in successful memory formation in the human cortex is unknown. Measures of PAC are difficult to interpret, however. Both increases and decreases in PAC have been lin ... Full text Link to item Cite

Optical monitoring of glucose demand and vascular delivery in a preclinical murine model

Conference Progress in Biomedical Optics and Imaging - Proceedings of SPIE · January 1, 2014 Targeted therapies such as PI3K inhibition can affect tumor vasculature, and hence delivery of imaging agents like FDG, while independently modifying intrinsic glucose demand. Therefore, it is important to identify whether perceived changes in glucose upta ... Full text Cite