Human performance effects attentional abilities

Representation of human-automation integration requires functions of attentional control and concurrent task performance. Distributed attention and attention switching refer to an operator s ability to perform multiple tasks simultaneously. In many cases, a second task can be added to the performance of a primary task with little or no impact to the performance of the first task. In other cases, the performance of two tasks simultaneously has a disastrous interaction. Such context-and order-sensitive effects are determined in the scheduling and agenda management function provided in the MIDAS model. Attention capture functions are represented through a preattentive filter mechtmism that responds to physical characteristics of environmental stimuli (e.g., color, blinking, auditory characteristics). 

Human error is therefore not the reason, but the effect of specific circumstances under which is an user. Still the deficit of specified human resources is a factor of the error. This deficit can be attention, ability to make decisions under stress or performance, regardless of the degree to assess whether he was the reason the chain of events. 

Acute physical and psychological effects. Marijuana intoxication has an adverse effect on attention span, short-term memory, and psychomotor performance. Anxiety and panic attacks can occur, primarily in new users who are not familiar with marijuanas eflFects. At very high doses, some people experience delusions and hallucinations. There are no cases of fatal marijuana poisoning and humans are very unfikely to be able to ingest a fatal dose. The eflFect of marijuana intoxication impairs motor and cognitive abilities necessary to safely drive a car or operate machinery. The extent to which marijuana is involved in auto accidents is unclear. Many motorists intoxicated with marijuana drive more slowly and carefully and take fewer risks. However, there is an increased risk of accidents after using marijuana, but marijuana alone does not appear to contribute a great deal to accidents. Marijuana in combination with alcohol does. 

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