News tips from the Journal of Neuroscience

09/15/04

1. Spontaneous firing in Clock Neurons
Alexander C. Jackson, Gui Lan Yao, and Bruce P. Bean

The biological clock depends on spontaneously firing neurons of the suprachiasmatic nucleus (SCN). Several ion channels, including L-type calcium channels, Ih, and subthreshold TTX-sensitive sodium channels, have been nominated for the spontaneous interspike "pacemaker" current that drives spontaneous firing. To distinguish between these candidates, Jackson et al. recorded from dissociated SCN neurons in current clamp and then used the firing pattern of each cell as a voltage command. When the sodium current was blocked, L-type channels were only able to support slow oscillations at more depolarized potentials.

2.The Who's Who Signal in Electric Fish
Bruce A. Carlson and Masashi Kawasaki

The African fish Gymnarchus niloticus uses a weak, quasisinusoidal electric organ discharge (EOD) to both communicate and navigate. The problem is that if neighbors use the same signal, it creates a serious "who's who" problem. The fish deal with this by shifting the frequency of their EOD, the "jamming avoidance response."

Source: Eurekalert & others

Last reviewed: By John M. Grohol, Psy.D. on 21 Feb 2009
    Published on PsychCentral.com. All rights reserved.

 

 

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