12 January 2020

Knowledge Representation: Beyond Mental Models (Part III)

Mental Models
Mental Models Series

Meaning is perceived, internalized, processed, externalized and communicated in, respectively by the mind through language. The morphological, syntactical and semantical structures as well the richness of the language(s) acquired have a considerable impact on our capability to describe and understand reality. Our mental space and structures evolve with the natural and diagrammatic languages used, the units of the language mapping to the units of our mental space.

At the base of any language are a set of signs and sounds we can easily recognize. Signs are written or printed marks that have standard meanings, while sounds are specific impressions we hear and which in given arrangements, when recognized, convey meanings. Signs together with shapes and objects form symbols that can be used to represent something else, their meaning being usually standardized, however one can assign them further meanings or create own symbols.
A word is a single unit of language that has meaning and can be spoken or written. Words are further grouped within expressions, sentences, propositions or phrases to convey a thought or idea, which are in turn further aggregated in simile, analogies, metaphors, parables and stories to convoy further meanings. A phrase is formed from multiple sentences that together convoy a certain meaning. An expression is a word or group of words used in a given situation or by particular people. A proposition is interpreted as either true or false.
A simile is the use of an expression that compares one thing with another using ‘as’ or ‘like’ in comparisons. An analogy is a comparison between things that have similar features or behavior, often used to help explain a principle or idea. A metaphor is an expression that describes one thing with the help of another thing considered to have similar characteristics. A parable is a short, simple story that teaches or explains an idea or truth, where a story is a description of a connected series of events and situations, either true or imagined.
Similes, analogies and metaphors are linguistic devices that add richness and further dimensions to our mental processes and meaning structures, from a literature as well a scientific aspect, if we consider that many of the scientific concepts are metaphors per se.    
Words or combinations of words can be used as labels for a concept. The totality of the words assimilated – for which a meaning is available – forms our vocabulary. Similes, analogies, metaphors, parables and stories can help clarify and enrich the meaning of a concept.
A phrase can attempt to describe a mental model, while a mental model can be built to understand or describe a phrase, however the two are not equivalent. In fact, to describe a model will be needed to describe its elements and the relations existing between them, together with the assumptions, beliefs and the constraints that hold. Often, despite the richness of a natural language’s vocabulary a description might need to use metaphors to convey an approximate meaning.
The given definitions are simplistic attempting to reflect the simplicity of the associations we hold between the various concepts, and together, concepts, associations and the meanings we hold form a mental model. Of course, the inner workings of the mind are much more complex, evidence for this complexity being the huge volume of books written over the centuries for the same purpose. There are also many intentional and unintentional gaps and probably misunderstandings, however the definitions are just an attempt to depict my understanding in the form of an externalized mental model. Luckily our mental models don’t need to be accurate in handling the reality and accomplishing the various tasks.
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Disclaimer: Most of the definitions were adapted from the Cambridge Dictionary, however there can be important deviations from the respective source.

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