Psychological
Mechanisms And Language Processing
Psycholinguistics
focuses on how people process language –how we comprehend and produce spoken
and written language- and how these skills are acquired. In order to understand
these language processes,we need to understand the major properties of language
as well as the processing characteristics of the individuals who use it.
For this
lecture, basic notions about the structure of language as well as basic
grammatical concepts will be assumed already known.
The
following concepts will be taken for granted.
1.
Linguistic productivity: this notion refers to the fact
that there is no limit to the number of sentences in a language.
2.
Duality of patterning: words are composed of phonemes
which, in turn, are composed of distinctive features. In each instance, the
smaller units are combined in a rule-governed manner to produce the larger
units.
3.
Morphology: words consist of one or more units of meaning
(morphemes). The system of grammatical morphemes in a language provides
speakers with a way of signaling subtle differences in meaning.
4.
Phrase structure: phrase structure rules codify our
intuitions about the groupings of words in a sentence. Some sentences are
ambiguous.
A.
The information processing system
According to this model of mental functioning,
environmental information entering into the cognitive system is successively
encoded, stored and retrieved by a set of distinct mental structures. The
emphasis is on the flow of information through the system. Let’s first briefly
give an overview of this model, before examining its relevance regarding
language processing.
Sensory
stores
The sensory
stores take in the variety of sensory events to which we are constantly exposed
(colors, tones, tastes, smells, etc.), and retain them for a brief period of
time in a raw, unanalyzed form Sperling’s princeps studies.
Working
memory
The second
type of memory has been traditionally referred to as short-term memory (STM),
and more recently as working memory (WM). Although the meaning of the words are
similar, there is a subtle difference between them.
Working
memory differs from short-term memory in that the term WM conveys a more
dynamic view of memory processes. STM was usually viewed as a passive
repository of information; WM has both storage and processing functions.
+ The
storage function is similar to the storage credited to short term memory:
we hold on a limited amount of information for a limited amount of time.
+ The
processing function is related to the concept of processing capacity.
Processing capacity refers to the total amount of cognitive resources we may
devote to a task (and this amount is assumed to be limited).
Permanent
memory.
Permanent
memory, which is also known as long-term memory (LTM), is a repository of our
knowledge of the world. This includes general knowledge (including the rules of
grammar or of arithmetic, along wih personal experiences such as memories of
our childhood and adolescence).
Tulving has
distinguished between two types of permanent memory: semantic memory and
episodic memory.
+ Semantic
memory:
Refers to
our organized knowledge of words, concepts, symbols and objects
+ Episodic
memory:
Holds traces
of events that are specific to a particular time and space.
+ Procedural
memory:
Is sometimes
distinguished from the other two memory structures. It specifically includes
information about motor skills (typing, swimming, bicycling, etc.)
B. Central
issues in language processing
In this
section, we examine several alternative ways in which linguistic information
can be handled by the information processing system that we have just sketched
above. Different types of process will first be presented and discussed
individually, before being applied to an extended example of language
processing.
·
Serial and parallel processing
Serial processing refers to processes that take place one
at a time. Parallel processing refers to processes two or more of which take
place simultaneously.
·
Top-Down and Bottom-Up
processing
A Top-down processing model, in contrast, states that
some information at the higher levels may influence processing at the lower
levels. Bottom-up processing is a processing which proceeds from the lowest
level to the highest level of processing in such a way that all of the lower
levels of processing operate without influence from the higher levels.
·
Automatic and Controlled
processes
Tasks that draw substantially from this limited pool of
resources are called controlled tasks, and the processes involved in these
tasks are referred to as “controlled processes”. Tasks that do not require
substantial resources are called automatic tasks, and processes that do not
require extensive capacity are referred to as “automatic processes”
·
Modularity of the language
processing system
The modularity position is that the language processing
system is a unique set of cognitive abilities that cannot be reduced to general
principles of cognition. The alternative position stresses the interconnections
between language and cognitive processes by emphasizing the role of concepts
such as working memory, automatic processing, and parallel processing in
language comprehension, production and acquisition.
C.
Development of the processing system
In order to
understand language acquisition, it would be helpful to understand the
cognitive abilities children bring to the task of acquiring their native
language. To this aim, let us ask to what extent the information processing
system that we have outlined above is operating during the first few years of
life.
Recent
research, however, has suggested that there are some important cognitive
similarities between children and adults.
Perceptual
processing.
Short-term
STM and Working memory WM