1. Immediate Memory : This is also known as short term memory. This memory is when the individual has to reproduce immediately after he has learnt something, thus the time span is very less for the matter to be registered in the consciousness. Hence the learnt matter is forgotten rapidly. e.g. we may first look at the seat number of our ticket & once we sit down we forget about it. In this type of memory, the retention time is very brief. Immediate memory is needed which helps us to learn a thing immediately with speed and accuracy, remember it fora short duration and forget it rapidly after use. 2.