Norman And Shallice Model

The Norman and Shallice Model is a cognitive framework proposed by Donald Norman and Timothy Shallice in 1986. This model aims to explain the role of executive control processes in human behavior and cognition.

Overview

The model suggests that the human cognitive system consists of a set of specialized perceptual modules or “agencies” that operate in parallel. These perceptual agencies are responsible for the automatic, bottom-up processing of incoming sensory information. However, these agencies are not directly connected to a person’s goals or intentions.

Supervisory Attentional System (SAS)

The Supervisory Attentional System (SAS) is a higher-level control mechanism that coordinates and regulates the activities of the perceptual agencies. It acts as an “executive” or “attentional controller” and is responsible for top-down control and the allocation of attentional resources.

Action Selection Mechanism (ASM)

The Action Selection Mechanism (ASM) is another essential component of the model. It processes the intentions, plans, and goals from the SAS and selects an appropriate action or set of actions to be carried out. The ASM operates by inhibiting or activating the relevant perceptual agencies, allowing the chosen action to be executed.

Error Detection and Correction

A crucial aspect of the Norman and Shallice Model is the presence of a monitoring system that detects errors or potential conflicts in the cognitive processes. When an error is detected, the SAS is responsible for initiating corrective actions to prevent or resolve the error.

Applications

The Norman and Shallice Model has been widely used in the field of cognitive psychology and has provided valuable insights into various aspects of human cognition and behavior. It has been particularly useful in explaining phenomena related to attention, action control, and error management.