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Lecture 10

PSYB65H3 Lecture Notes - Lecture 10: Sound, Middle Ear, Oval WindowPremium

5 pages24 viewsFall 2015

Department
Psychology
Course Code
PSYB65H3
Professor
Zachariah Campbell
Lecture
10

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Week 11 Lecture #10: Wednesday November 18, 2015
Remaining Slides
• This is where we reached at 2:00 PM and concluded the lecture.
• There were/are six slides that would have been covered with some extra time.
• They are provided after this slide to help itemize some of the conditions that
accompany certain injuries to various parts of the visual system.
• Further details with examples are provided
- different between sign and symptoms
- symptoms is sth that patient reports as their subjective experience (e.g., pain)
- sign is sth that a physician observes
- the patient might not be aware of this
Injury to the Pathway Leading to the Cortex
• Monocular Blindness
Destruction of the retina or optic nerve of one eye that produces loss of sight in
that eye
- one eye is not receiving or sending info to the other
• Homonymous Hemianopia
Blindness of an entire left or right visual field
• Quadrantanopia
Blindness of one quadrant of the visual field
- fou quads, L upper/ lower & R upper and lower
• Scotoma
Small blind spot in the visual field caused by a small lesion or migraines of the
visual cortex
- dorsal stream, going towards parietal, responsible on how we use visual info to act on it
- give an handshake
- ventral, going towards temporal
- identifying someone face
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Injury to “What” Pathway
Agnosia = not knowing
• Visual-Form Agnosia
Inability to recognize objects or drawings of objects
- involve ventral pathway
• Color Agnosia (achromatopsia)
Inability to recognize colors
• Face Agnosia (prosopagnosia)
Inability to recognize faces
• Although patients with visual-form agnosia cannot recognize objects, they can:
Copy objects and even draw objects from memory, but they cannot later
recognize these copied objects
Still appropriately shape their hands when grasping for objects, despite not
being able to recognize those objects
Injury to the “How” Pathway
• Optic Ataxia
Deficit in the visual control of reaching and other movements
Damage to parietal cortex
Can recognize objects normally
The Transduction of Sound, Auditory System
Perception of Sound
• Auditory system converts the physical properties of sound-wave energy into
electrochemical neural activity that travels to the brain
- capturing a diff part of the electromagnetic system
- sounds, vibration of physical properties
• Sounds like visual experiences are products of brain activity
• How do we characterize the characteristics of sound?
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