A new instrument for the recording of leaf movement rhythm is described. Coleus blumei x C. frederici, a short day plant, exhibits a circadian rhythm of leaf movement. The period length of the free running rhythm is shortest in continuous darkness and is increased with an increase in the light intensity. The amplitude of the rhythm tends to damp in continuous bright light.

Speech rhythm has been investigated from phonetic, phonological and signal processing perspectives, leading to a wide range of non–comparable methodologies. We assume that this is because speech rhythm is an emergent phenomenon (Emergent Rhythm Theory), due to many ‘hidden’ physiological and other factors, and that specialists make different selections from these factors. We also claim that mod...

In green iguanas, the pineal controls the circadian rhythm of body temperature but not the rhythm of locomotor activity. As part of a program to investigate the characteristics of this multioscillator circadian system, the authors studied the circadian rhythms of the electroretinographic response (ERG) and asked whether the pineal gland is necessary for the expression of this rhythm. ERGs from ...