Purpose The hippocampus plays a central role in cognitive and affective processes and is commonly implicated in neurodegenerative diseases. Our study aimed to identify and describe a hippocampal network model (HNM) using trans-diagnostic MRI data from the BrainMap® database. We used meta-analysis to test the network degeneration hypothesis (NDH) (Seeley et al., 2009) by identifying structural a...

In this contribution we solve the following problem. Let Hnm be a Hilbert space of dimension nm, and let A be a positive semidefinite self-adjoint linear operator on Hnm. Under which conditions on the spectrum has A a positive partial transpose (is PPT) with respect to any partition Hn⊗Hm of the space Hnm as a tensor product of an n-dimensional and an m-dimensional Hilbert space? We show that t...

Working memory tasks have been associated with the appearance of elevated single unit activity (SUA) in primate studies, and oscillatory activity in the EEG or the local field potential (LFP) in humans. The study by Lee et al. in this issue of Neuron provides novel insights regarding the relationship between SUA and LFP rhythmicity in V4 during working memory tasks.

In the case of oscillatory potential, we present a Lyapunov type inequality for second order differential equations of the form (r(t)Φβ(x ′(t)))′ + q(t)Φγ(x(t)) = 0, in the sub-half-linear (0 < γ < β) and the super-half-linear (0 < β < γ < 2β) cases where Φ∗(s) = |s|∗−1s. AMS (MOS) Subject Classification. 34C10, 34C15.

Some spatially homogeneous Bianchi type I cosmological models filled with homogeneous “electric” p-form fields are shown to mimic the never-ending oscillatory behaviour of generic string cosmologies established recently. The validity of the “Kasner-free-flights plus collisions-on-potential-walls” picture is also illustrated in the case of known, non-chaotic, superstring solutions.

The subthalamic nucleus-globus pallidus network is a potential source of oscillations in Parkinson's disease, but the mechanism is unknown. In this issue of Neuron, Chu et al. (2015) present a cortically driven form of heterosynaptic plasticity that could promote oscillatory activity after dopamine depletion.

This paper presents simplified hydrodynamics model for a biomimetic robot fish based on quantitative morphological and kinematic parameters of crangiform fish. The motion of four Pangasius sanitwongsei with different length and swimming speed were recorded by the digital particle image velocimetry (DPIV) and image processing methods and optimal coefficients of the motion equations and appropria...

Retinal ganglion cells (RGCs) spike randomly in the dark and carry information about visual stimuli to the brain via specific spike patterns. However, following photoreceptor loss, both ON and OFF type of RGCs exhibit spontaneous oscillatory spike activity, which reduces the quality of information they can carry. Furthermore, it is not clear how the oscillatory activity would interact with the ...