Cognitive load theory proposes that the human brain has limited working memory but unlimited long-term memory. It aims to develop instructional techniques that fit within the constraints of working memory to maximize learning. The theory supports explicit models of instruction where teachers clearly demonstrate skills rather than having students discover information. It posits that knowledge is stored in long-term memory as schemas that organize information and reduce cognitive load by acting as single elements in working memory despite complexity. Developing schemas allows combining of elements into higher-order schemas in a way that bypasses working memory limits and automates information processing.
2. What is cognitive load theory?
Cognitive load theory is built upon two commonly accepted ideas.
The first is that there is a limit to how much new
information the human brain can process at one time.
The second is that there are no known limits to how much-stored information can
be processed at one time. The aim of cognitive load research is therefore to develop
instructional techniques and recommendations that fit within the characteristics of
working memory, in order to maximize learning.
3. Cognitive load theory supports explicit models of instruction, because such
models tend to accord with how human brains learn most effectively
(Kirschner, Sweller & Clark 2006).
Explicit instruction involves teachers clearly showing students what to do
and how to do it, rather than having students discover or construct
information for themselves.
4. How the human brain learns?
Working memory is the memory system where small amounts of
information are stored for a very short duration (Peterson & Peterson
1959)1. Working memory roughly equates with what we are conscious of at
any one time.
Long-term memory is the memory system where large amounts of
information are stored semi-permanently.
5. How the human brain learn: continuation
Cognitive load theory assumes that knowledge is stored in long-term
memory in the form of schemas'2
A schema organizes elements of information according to how they will be
used.
According to schema theory, skilled performance is developed through
building ever greater numbers of increasingly complex schemas by
combining elements of lower level schemas into higher level schemas.
6. How the human brain learns: continuation.
Children begin to learn to read by constructing schemas for squiggles on a
page letters. . Children begin to learn to read by constructing schemas for
squiggles on a page letters.
These simple schemas for letters are used to construct higher order schemas
when they are combined into words. The schemas for words, in turn, are
combined into higher order schemas for phrases and sentences.
This process of ever more complex schema construction eventually allows
readers to scan a page filled with squiggles and deduce meaning from it
7. How the human brain learns: continuation
Schemas provide a number of important functions that are relevant to learning:
First, they provide a system for organizing and storing knowledge.
Second, and crucially for cognitive load theory, they reduce working memory load.
This is because, although there are a limited number of elements that can be held in
working memory at one time, a schema constitutes only a single element in working
memory. In this way, a high-level schema with potentially infinite informational
complexity can effectively bypass the limits of working memory
8. If working memory is overloaded, there is a greater risk that the content
being taught will not be understood by the learner, will be misinterpreted or
confused, will not be effectively encoded in long-term memory, and that
learning will be slowed down (Martin 2016, p. 8).
The automation of schemas reduces the burden on working memory
because when information can be accessed automatically, the working
memory is freed up to process new information.
10. Reference
NSW Department of Education. 2017. Centre for Education Statistics and
Evaluation. Cognitive load theory: Research that teachers really need to
understand.