Evidence for the two-state model of nematode behaviour

摘要: A MODEL for the swimming and orientation of Panagrellus silusiae based on transitions between two behavioural states has been proposed1. The basis this model is that in normal, unstimulated conditions nematode follows a more or less linear path with anterior posterior ends animal sweeping through minimal area. This termed ‘normal’ state. When stimulated by chemical physical means, enters ‘activated’ state, making rapid changes maximal In case gradient an attractant, remains activated state until it orientates to sensing maximum difference intensity stimulus sensory structures, at which point returns normal migrates source attractant. Laser microbeam studies indicated copulatory spicules free-living P. function as receptors mating attraction species1, also found other species2.