This paper investigates the dynamics of a competitive single-prey n-predators model of integrated pest management, which is subject to periodic and impulsive controls, from the viewpoint of finding sufficient conditions for the extinction of prey and for prey and predator permanence. The per capita death rates of prey due to predation are given in abstract, unspecified forms, which encompass la...

That memory involves enduring physical changes in the organism has been proposed, using era-dependent metaphors, since antiquity. 1 More than a century ago, Richard Semon introduced the term engram to refer to such a change. 2 It gained popularity, however, only when a group of researchers, most notable among them Karl Lashley, embarked on a systematic hunt for engrams, using lesions to determi...