We investigated the relationship between sleep timing and the timing of the circadian rhythm of plasma melatonin secretion in a group of healthy young and older subjects without sleep complaints. The timing of sleep and the phase of the circadian melatonin rhythm were earlier in the older subjects. The relationship between the plasma melatonin rhythm and the timing of sleep was such that the ol...

Several recent studies have demonstrated that the cerebellum plays an important role in temporal processing at the scale of milliseconds. However, it is not clear whether intrinsic cerebellar function involves the temporal processing of discrete or continuous events. Temporal processing during discrete events functions by counting absolute time like a stopwatch, while during continuous events i...

This work tests the hypothesis that the cerebellum is critical to the perception of the timing of sensory events. Auditory tasks were used to assess two types of timing in a group of patients with a stereotyped specific degeneration of the cerebellum: the analysis of single time intervals requiring absolute measurements of time, and the holistic analysis of rhythmic patterns based on relative m...

The relative timing of presynaptic and postsynaptic spikes plays a critical role in activity-induced synaptic modification. Here we examined whether plasticity of orientation selectivity in the visual cortex depends on stimulus timing. Repetitive pairing of visual stimuli at two orientations induced a shift in orientation tuning of cat cortical neurons, with the direction of the shift depending...

This study focuses on the intraday relative timing of same day announcements of earnings and dividends. The price effects of three timing patterns are examined: (a) both earnings and dividends announced after the close of trading, (b) dividends announced before and earnings announced after the close of trading, and (c) earnings announced before and dividends announced after the close of trading...

Yolanda E. Morbey* and Ronald C. Ydenberg Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada. *Correspondence: Department of Zoology, Ramsay Wright Zoological Laboratories, University of Toronto, 25 Harbord St., Toronto, Ont., M5S 3G5, Canada. E-mail: [email protected] Abstract Protandry, the e...

AN OBJECT CAN BE CATEGORIZED AT DIFFERENT LEVELS OF ABSTRACTION: as natural or man-made, animal or plant, bird or dog, or as a Northern Cardinal or Pyrrhuloxia. There has been growing interest in understanding how quickly categorizations at different levels are made and how the timing of those perceptual decisions changes with experience. We specifically contrast two perspectives on the timing ...