The cell and anatomy division Chapter 5 answered!2022

The cell and anatomy division Chapter 5 answered!2022Perception -Organizing and givingmeaning to input Absolute threshold -Intensity at which stimulates -Lower the threshod: higher the intensity Signal detection theory -ow certain are we that stimulate is present> -What criteria do we use> What can signal detection theory show us> What are the 2 conditions of signal detection thoery? Stimulus present or Stimulas absent What are the 4 possibe outcomes? -miss -hit -false alarm -correct rejection Difference threshold -The smallest difference that can be detected 50% of the time. -Just noticeable difference (JND) Weber's law -JND is proportional not a constent amount -For weight is about 1/50 -For 50 grams; 10 grams is needed Sensory adaption -Diministrating sensitivity to uncharging stimulus Adaptive value Free senses to be more sensitive to changes in environment Cornea Transparent protective structure Pupil Adujstable opening that controls the amoujnt of light Lens -Elastic structure for focusing -Thinner to focus on distant objects -Thicker to focus on nearby objects Retina Photoreceptors transduce light energy into electrical impulses Myopia -Nearsightedness (difficulty seeing far away objects) -Eyeball is longer (back to front) -Lens focuses light in front of retina Hyperopia -Farsigtnedness (difficult seeing cloe up objects) -eyeball is too short -lens focus light behind retina Photoreceptor location Located behind retina Cones photoreceptor -For color and detail -Functions best in high illumation -concentrated in centre of retina -Fovea (in centre of retina) contains only cones Rods photoreceptors -Function best in low illumination -500 times more sensitive to light than cones -Found mostely in periphery of retina - through everywhere in retina except foea Tansduction Converting characteristics of stimulus to nerve impulses Visual transduction -Actionof photopigments -Absorption of light changes rate of neurotransmitter released -greater rate of relaes = stronger the signal is passed on