Concept

Parallel processing (psychology)

Summary
In psychology, parallel processing is the ability of the brain to simultaneously process incoming stimuli of differing quality. Parallel processing is associated with the visual system in that the brain divides what it sees into four components: color, motion, shape, and depth. These are individually analyzed and then compared to stored memories, which helps the brain identify what you are viewing. The brain then combines all of these into the field of view that is then seen and comprehended. This is a continual and seamless operation. For example, if one is standing between two different groups of people who are simultaneously carrying on two different conversations, one may be able to pick up only some information of both conversations at the same time. Parallel processing has been linked, by some experimental psychologists, to the stroop effect (resulting from the stroop test where there is a mismatch between the name of a color and the color that the word is written in). In the stroop effect, an inability to attend to all stimuli is seen through people's selective attention. In 1990, American Psychologist David Rumelhart proposed the model of parallel distributed processing (PDP) in hopes of studying neural processes through computer simulations. According to Rumelhart, the PDP model represents information processing as interactions between elements called units, with the interactions being either excitatory or inhibitory in nature. Parallel Distributed Processing Models are neurally inspired, emulating the organisational structure of nervous systems of living organisms. A general mathematical framework is provided for them. Parallel processing models assume that information is represented in the brain using patterns of activation. Information processing encompasses the interactions of neuron-like units linked by synapse-like connections. These can be either excitatory or inhibitory. Every individual unit's activation level is updated using a function of connection strengths and activation level of other units.
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