Usually the whole is the sum of its parts (added linearly): someone is happy and travelling, so happy travelling. Someone walks across a motionless and stable bridge and thus moves forward. But when hundreds of people walk together, the bridge may start to wobble quite suddenly. Both systems - the pedestrian …

The article argues that a dynamic systems theory approach can be helpful in understanding intrapersonal psychological behaviour changes. In terms of control and coordination, different movement systems - walk, trot, canter - are incomparable. This is also the case with psychological phase transitions. …

Due to their high adaptability and opportunistic predation behaviour feral cats have a great impact on worldwide bird biodiversity in particular on islands. However not much is known about their actual behaviour and time budget, as direct behavioural observations often are difficult regarding free-ranging …