Spike timing reliability in the prefrontal cortex depends on the frequency content of its synaptic i
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A periscopic rear view optical system for vehicles in which an image of a rearward objective is reflected downwardly from a rooftop mirror through a prismatic device constructed as a transparently faced housing filled with a liquid suitable for the optical path to be within the critical angle at the desired reflective faces for reflection of the image to the driver of the vehicle. A modification of the device includes adjustable prism faces to accommodate different driver heights, with the spatial dimension variations produced by the adjustment effecting a vertical movement of the device.