Modern dialogue systems leave much to be desired since knowledge about processing information in the human brain is not used in their development. The human effectively implements dialogue behavior as purposeful behavior because in their information processing system there is a model of the world with its language component. The paper presents a model of the world consisting of: the posterior cortex, which provides the semantic processing of sensory information; the hippocampus structuring this representation in fragments corresponding to individual situations; and the anterior cortex, which forms on their basis a pragmatic level of information representation-a chain of such situations that make it possible to implement purposeful behavior; and also manipulate these hippocampal representations with the help of the thalamus. Modern dialogue systems are very simple. When replying to a question, even the most complex of them are limited to giving information about relevant facts, while primitive ones discredit the domain area by imitating a meaningless dialogue resembling communication only in its form. At the moment, there has been a transition to dialogue systems that include a world model. However, dialogue is not a series of passive answers to the questions posed. The dialogue has its own motive, its purpose, its plan. That is, it is an example of purposeful behavior, and the system modeling it should include in its architecture all the components necessary for the implementation of purposeful behavior. In order to understand what these components should be, it is natural to turn to the analysis of the human brain and its functionality in the process of implementing purposeful behavior. The human brain is a natural neural network that provides a very non-uniform processing of information that is, it is a highly heterogeneous neural network. And the processing of information in the process of purposeful behavior consists in the formation of a world model (and manipulation of it).

It is in the lamellae of the hippocampus where information on the relationships of images of events stored in the columns of the posterior cortex is formed, stored and dynamically changed, as they are presented in particular situations. That is, the model of the world is not only a collection of images of events stored in the cortex columns (virtually represented as a homogeneous semantic network), but also a set of images of situations stored in the hippocampal lamellae. Moreover, this hippocampus representation structures the initial model of the world-a semantic network: in a separate lamella of the hippocampus a graph is stored that is a sub-network of a global network describing a particular situation. The structure of this situation is described by the structure of the extended predicate structure of the sentence describing this situation. 

Consideration of the essentially heterogeneous processing of information in the brain allows for the conclusion that the architecture of the purposeful dialogue systems cannot be homogeneous, than it must necessarily include a world model with a search subsystem for this world model, a naturallanguage sequence of questions and answers necessary to understand the questions and to formulate answers to these questions taking into account the reaction of the world model, as well as the attention mechanism that makes it possible to form the processing operations from accurate focusing on one process to full defocusing with the involvement of all possible processing operations. The dialogue must be implemented as a purposeful process, in which the motive, purpose and plan of the dialogue are clearly seen. And the functioning of the system for implementing a purposeful dialogue must include the following steps:

(1) Formation of a world model (including a language model), which includes both hierarchies of syntagmatic sensory (in the posterior cortex columns) and effector (in the anterior cortex columns) processing and presentation of information, and the paradigmatic representation (in the hippocampal lamellae)

(2) Identification of the purpose of the dialogue

(3) Formation of a dialogue plan as the choice of a chain of images of a pragmatic level of information representation and

(4) Monitoring the implementation of the plan by correlating the incoming current information with that presented in the plan, with the possibility of adjusting the plan in order to approximate the real conditions.

With Regards,
Joseph Kent
Journal Manager
Journal of Brain Behaviour & Cognitive Sciences