Perception Flashcards
What forms part of the clinical picture of many mental disorders?
Abnormal perceptual experiences
These experiences can manifest in various ways, affecting how patients perceive reality.
What are the five special senses involved in perceptual information?
- Vision
- Hearing
- Touch
- Taste
- Smell
These senses help the brain receive and process perceptual information.
What is the role of proprioceptors and the vestibular apparatus in perception?
They provide information about muscle, joint, and internal organ positions
This information contributes to the overall perceptual experience.
How is an external object represented internally in the brain?
By a sensory percept that combines with memory and experience
This process creates a meaningful internal percept in the conscious mind.
What distinguishes normal from abnormal perceptual experiences?
The ability to distinguish between real objects and internal imagery or fantasy
In health, individuals can recognize vivid experiences as not real.
What are the two types of abnormal perceptual experiences?
- Altered perceptions
- False perceptions
Each type presents differently in terms of perception and awareness.
What are altered perceptions?
Sensory distortions and illusions involving distorted internal perceptions of real external objects
These can affect how a person experiences reality.
What are false perceptions?
Hallucinations and pseudo-hallucinations where internal perception occurs without an external object
These can significantly impact an individual’s reality.
What are sensory distortions?
Changes in perceived intensity or quality of a real external stimulus
They are often associated with organic conditions or drug ingestion.
What is hyperacusis?
Experiencing sounds as abnormally loud
This is an example of a sensory distortion.
What is micropsia?
Perceiving objects as smaller and further away, as if looking through the wrong end of a telescope
This is another example of sensory distortion.
Fill in the blank: The majority of perceptual information is processed _______.
unconsciously
Only a minority of this information reaches conscious awareness at any one time.
What are illusions?
Altered perceptions combining a real external object with mental imagery to produce a false internal percept.
What predisposes a person to experience illusions?
Both lowered attention and heightened affect.
What are affect illusions?
Illusions occurring at times of heightened emotion, such as seeing a tree as an attacker when scared.
What are completion illusions?
Illusions based on the brain’s tendency to fill in missing parts of an object to create a meaningful percept.
What are pareidolic illusions?
Meaningful percepts produced from a poorly defined stimulus, such as seeing faces in clouds.
Define a hallucination.
‘A percept without an object’ as defined by Esquirol in 1838.
How do hallucinations differ from normal perceptions?
A true hallucination is perceived as being in external space, distinct from imagined images.
What is a pseudo-hallucination?
A hallucination that lacks characteristics of true hallucinations and is experienced as internal.
What is the only characteristic of true perceptions that true hallucinations lack?
Publicness; hallucinating patients recognize their experiences are not shared by others.
What are first-rank symptoms of auditory hallucinations in schizophrenia?
- Hearing a voice speak one’s thoughts aloud
- Hearing a voice narrating one’s actions
- Hearing two or more voices arguing
What are visual hallucinations commonly associated with?
Organic disorders of the brain, drug and alcohol intoxication and withdrawal.