SENS & PERCEP PROCSS
SENS & PERCEP PROCSS PSYC 4031
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This 5 page Class Notes was uploaded by Clementine Boehm on Tuesday October 13, 2015. The Class Notes belongs to PSYC 4031 at Louisiana State University taught by P. Geiselman in Fall. Since its upload, it has received 50 views. For similar materials see /class/222932/psyc-4031-louisiana-state-university in Psychlogy at Louisiana State University.
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Date Created: 10/13/15
Ch 3 Visual System Tuesday September 14 2010 912 AM the individuals who posess this capability I Colored hearing is most common I Smell hues in paintings and taste the shape of foods eg chicken is pointy I Caused probably by a single Xlined gene 1 in 2000 people are synesthetes Colored hearing test I Nonsynesthetes were retested one week later and gave matching answers only 37 of the time I Synesthetes were retested 15 years later and gave answers 92 of the time 0 Uyellow to light brown 0 white to pale gray O Owhite FM RI tracks blood flow and brain activity Researchers found 0 Primary and secondary visual cortex in the occipital lobe do not show an increase in activity 0 Inferior temporal cortex in the temporal lobe shows increased activity which is higher for processing visual info I Our anatomy and physiology determine our perception Original trichromatic theory can detect red green and blue is incorrect we can now detect more Video Light that actually hits your eye is called quotwhite Lightquot I Vision consists of light color form and depth I Motion and depth processed in the primary visual cortex Brain processes motion in black and white I Guy with stroke I Can39t recognize faces but recognizes voices Perception of a wavelength is a hue we see color distance that light travels in one cycle from peak to peak 39 shows the wide range of energy in the environment and the small range withIn this spectrum called visible light that we can see u the number of wavelengths present 1 wavelengthpurity I Adding wavelengths decreases the purity Purity saturation we see bright colorsaturatedl 670 nm pure red unsaturated Purity saturated 470 nm pure blue Purity saturated 470 670 nm unsaturated Contains all wavelengths of visible spectrum m height ofthe light wave gt our perception is brightness I Amplitude intensity sensation Light and dark not correct terminology gt stimuli getting brighter and brighter The Eye n does 23 of light bending and is constant the transparent outside of the eye I Astigmatism acquired injury to the cornea I Congenital form associated with nearsidedfarsided cornea is in oval shape m does the rest of the light bending to focus stimulus on the retina I T 392 attach cilliary and lenses together 39 39 when contract gt thicken the lens when relaxgt thin the lens a change in the shape of the lens to bring the stimulus into focus on the W m 07 retina m clouding of the lens lens grows throughout lifetime eventually when cilliary muscles contract they cannot thicken the lens enough to see near objects become farsighted hypermetropic u i contains aqueous humor supplies eye with nutrients and oxygen very similar to cerebral spinal fluid build up ofaqueous humor in eye 3 i n filled with vitreous humor thickjelly like substance that helps maintain the shape ofthe eyeball contains arteries and veins supplies the retina with oxygen and nutrients brown and can absorb scattered light and make vision clearer M where transduction occurs change lightwave into electrotransmitters contains rods and cones 1M mm in l UH Ell contains i c in the center of the retina which contains only cones Macular degeneration blindness usually diagnosed in the elderly gtloss of blood vessels which lead to loss of photoreceptors Nervous System is a collection of axons or fibers in the peripheral nervous system all the nervous structures outside the CNS here communication between neurons takes place where the electrochemical activity is initiated 0 activity is transferred down DuplexDuplicity Theory look up more inf50 m the number of photoreceptors per ganglion direct relationship between convergence and sensitivity Inverse relationship between convergence and acuity inverse relationship between sensitivity and acuity Rods low convergence High sensitivity I Low acuity Can detect low levels of illumination Much convergence Not designed to detect Cones low convergence Low sensitivity I High acuity Cannot detect low levels of illumination Very little convergence 2 39 i x drop a microelectrode into a single axon in the optic nerve shine a light on a given photoreceptor to see if it has a change in 0activity in the ganglion cell the portion of the retina that produces a change in the firing rate of a given ganglion chg can be excitatory or inhibitory firing i hine light on center it turns ganglion on produces excitatory shine light into surround area turns off when you shine light inhibitory Look at table 32 important in giving us binocular vision I Where the CNS begins gt optic tract where the tracts will go Superior Colliculus Thursday September 09 2010 910 AM the individuals who posess this capability Colored hearing is most common Smell hues in paintings and taste the shape of foods eg chicken is pointy Caused probably by a single Xlined gene 1 in 2000 people are synesthetes Colored hearing test Nonsynesthetes were retested one week later and gave matching answers only 37 of the time Synesthetes were retested 15 years later and gave answers 92 of the time 0 Uyellow to light brown 0 white to pale gray O Owhite FM RI tracks blood flow and brain activity Researchers found 0 Primary and secondary visual cortex in the occipital lobe do not show an increase in activity 0 Inferior temporal cortex in the temporal lobe shows increased activity which is higher for processing visual info Our anatomy and physiology determine our perception Original trichromatic theory can detect red green and blue is incorrect we can now detect more Video Light that actually hits your eye is called quotwhite Lightquot Vision consists of light color form and depth Motion and depth processed in the primary visual cortex Brain processes motion in black and white Guy with stroke 0 Can39t recognize faces but recognizes voices
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