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Cover picture: Representation of the array of paintbrush-like axon terminals in a slab of pigeon optic tectum. The axons originate from the nucleus isthmi pars parvocellularis (Ipc) located below the tectum. Physiological experiments described in our paper show that these presumably cholinergic terminals mediate the prominent, visually triggered, oscillatory bursts recorded across tectal layers. Bursting potentials ascending through these terminals may act as a focal beam of attention enhancing the saliency of stimuli in the corresponding location of visual space. Axons are depicted more sparsely for a better assessment of their morphology. Few scattered cell bodies are represented in tectal layers 13 (white) and 10 (blue). (This cover image was designed by Pablo Belmar based on a paintbrush reconstruction made by Anne Berking.) For details, see the article by Marín et al. in the July 27, 2005 issue (pages 7081-7089).