Lecture08+full+notes

Lecture08+full+notes - Slide 1 Lecture 08: Occipital Lobe...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Slide 1 Lecture 08: Occipital Lobe (Part 2)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slide 2 Review Questions 1) Why is standardization important for neuropsychological assessment? 3) What are the major domains of multidimensional testing? 4) List the advantages & disadvantages of standard battery testing vs process-oriented testing? 5) What is the Gestalt perspective on creating an image? Do clinical case studies support this view? 6) Discuss the neuroanatomy of the visual system. 7) What is the basic visual pathway?
Background image of page 2
Slide 3 Occipital Lobe
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slide 4 Vision: Perception is in the eye of the beholder Recall that the principle function of the occipital lobe is vision. What we visually perceive does not reflect absolute properties of what we are seeing. 2 common examples of visual systems that do not perfectly match our own: flies (bottom left) & dogs (bottom right).
Background image of page 4
Slide 5 Occipital Lobe: Outline I. Visual Pathway II. Neuroanatomy of visual system III. Cortices IV. Disorders
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slide 6 © John W. Rose, M.D.; Maria Houtchens, MSIII; Sharon G. Lynch, M.D. Fovea Blind spot (optic disk) sclera iris pupil Light passes through cornea, which bends them slightly & sends through the lens where they get bent a whole lot more so visual image is focused on receptors at back of eye. Light then passes through photoreceptors to sclera, which reflects light back to receptors again. Fovea is retina’s central portion (where images are clearest) & blind spot is where optic nerve passes through.
Background image of page 6
Slide 7 Back Of Eye Light Retina: 3 cell layers Cones : photoreceptive cells that turn bright light energy into action potentials (used for daytime vision & color vision); visual acuity best when looking directly at objects Rods : photoreceptive cells that are sensitive to dim light (used for night vision); visual acuity best when looking slightly away Light comes in & gets reflected to back of the eye, where photoreceptors innervate bipolar cells, which then activate ganglion cells to send visual information to brain proper
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slide 8 The basic visual pathway • Photons converted to neuronal signals • Axons convey information to lateral geniculate nucleus (LGN) in thalamus • Information then relayed (via optic radiations) to striate cortex Because photons activate visual neurons, produce light; if activated auditory neurons, would instead produce sound.
Background image of page 8
Slide 9 Thalamus Occipital lobe Medial view of right cerebral hemisphere thalamus Lateral ventricle Corpus callosum
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slide 10 Neural information from retina transmitted via optic nerve; Synapses terminate on lateral geniculate nucleus (or body) Recall that the thalamus is the relay station of the brain; stimuli enter here & then get sent to various portions of the cortex; the optic nerve transmits information to the lateral geniculate body of the thalamus, which then send projections to the visual cortex.
Background image of page 10
Slide 11 Neuroanatomy of the visual system This gives us an overview of the neuroanatomical structures important for vision. Optic chiasm: where optic nerves partially cross
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 42

Lecture08+full+notes - Slide 1 Lecture 08: Occipital Lobe...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online