Acute fluctuating disturbance of attention, awareness, and cognition; develops over hours to days; usually reversible This condition falls within the domain of consciousness in cognitive psychology and neuropsychology.
Neural and Anatomical Basis
The neuroanatomical basis of delirium involves multiple brain structures and pathways, including Diffuse cortical, reticular activating system, thalamus, and prefrontal cortex. The interplay among these regions determines the specific pattern and severity of cognitive impairment.
Cognitive and Functional Impact
This condition affects multiple cognitive functions:
- Attention
- orientation
- memory
- perception
- sleep-wake cycle
The severity and combination of these impairments varies across individuals and can significantly impact daily functioning, social relationships, and independence.
Causes and Risk Factors
Multiple etiological factors have been identified:
- Infection
- medication
- metabolic disturbance
- surgery
- hospitalization
In many cases, the condition arises from an interaction of genetic predisposition, environmental factors, and specific precipitating events. Understanding these causes is essential for prevention, early detection, and targeted treatment approaches.
Delirium is relevant to clinical neuropsychology, cognitive rehabilitation, and our broader understanding of brain-behavior relationships. Assessment typically involves neuropsychological testing, neuroimaging, and detailed clinical history. Treatment approaches may include cognitive rehabilitation, pharmacological intervention, compensatory strategy training, and supportive therapies tailored to the individual's specific pattern of strengths and weaknesses.
Disorder Of
Selective Attention
Delirium can affect selective attention, the ability to focus on relevant information while filtering out distractions. This makes it difficult to concentrate on target information in the presence of competing stimuli.
Neural Correlates of Consciousness
Delirium can affect consciousness and arousal, the foundational states of wakefulness and awareness that underlie all higher cognitive function. This can affect the sleep-wake cycle, the level of alertness, or the basic capacity for conscious awareness and purposeful interaction with the environment.
Long-Term Memory
Delirium can affect long-term memory, the system for storing information over extended periods. This can result in difficulty retaining new information, recalling past experiences, or both, depending on the nature and progression of the condition.
Visual Perception
Delirium can affect visual perception, the brain's ability to interpret and make sense of visual information. This disruption can affect various aspects of visual experience including acuity, field of vision, visual awareness, or the higher-level interpretation of visual input.