PYSC1001 Chapter 4 Exam Questions With Verified Solutions

PYSC1001 Chapter 4 Exam Questions With Verified Solutions What is your absolute threshold? - answerthe point at which you detect a stimulus about half of the time Werner was having his hearing tested, and a number of the tones that were presented were so faint he was not able to detect them. What can you say about the faint sounds? - answerThey are below Werner's absolute threshold for sound Giovanni was watching the night sky on a clear evening in November. He noticed that sometimes when he looked directly overhead he could detect a very faint star. A few minutes later, it seemed that the star had disappeared and then it "appeared" again. How would you describe the light from the star in this case? - answerIt is just at Giovanni's absolute threshold for light. Feature analysis assumes that we progress from individual elements to the whole in the formation of our perceptions. Which of the following processes describes feature analysis? - answerbottom-up Vanessa describes a new melody that she heard at a concert by telling you each of the individual notes in the order that they were played. In providing this type of description, which type of processing does Vanessa appear to use? - answerbottom-up What is the structure of the ear that transduces sound vibrations into nerve impulses? - answercochlea Jefferson has had years of exposure to high-amplitude sound through his work as a helicopter mechanic. Lately he has noticed that he is losing his ability to detect high-frequency sounds. What has Jefferson most likely damaged? - answerhis cochlea Which structure of the ear serves a similar function as the retina serves in the eye? - answercochlea What aspect of perception is affected by the wavelength of light? - answercolour What affects our perception of the brightness of a colour? - answeramplitude of light waves Petra has vision problems because of a syndrome that causes her cones to be faulty. Her rods function normally. Which of the following aspects of Petra's vision is likely to be deficient? - answercolour vision Imagine that biologists have discovered an animal that has eyes very similar to human eyes, but that the only receptor cells in the retina are rods; there are no cones. What would you expect about this animal's vision, based on what is known about human vision? - answerIt would have no colour vision. While finger painting, Imran mixed yellow paint and blue paint and ended up with green. Which mixing method did Imran use? - answersubtractive colour mixing If you were to shine lights of different colours onto a surface, so that the lights overlap, what type of colour mixing are you using? - answeradditive If you project a red, a green, and a blue light into space, what colour will be perceived at the point where the three lights cross? - answerwhite If you mix red, green, and blue paint, what colour will you get? - answerblack At the musical he attended over the weekend, Andrew noticed that whenever the red and green spotlights overlapped, they seemed to change to a yellow spotlight. Which principle explains this perception? - answeradditive colour mixing Television sets are able to re-create the entire visible spectrum by mixing three primary colours of light. Which theory of human colour vision is similar to this mechanism? - answertrichromatic What differs in the visual perception of a human dichromat and a human trichromat? - answercolour vision Eli has been wearing green welding goggles for the past 30 minutes. Based on the opponent process theory of colour vision, what colour will white objects appear to be for a brief time after Eli takes off the green goggles? - answerred According to one theory of colour vision, colours are signalled in pairs by neurons that fire faster to one colour and slower to another colour. What is this theory called? - answeropponent process theory Denise was momentarily blinded when paparazzi snapped her picture using a blue flash. Following the flash, she saw spots for several minutes. What colour were the spots, based on the opponent process theory of colour vision? - answeryellow Which theory of colour vision is supported by the action of the lateral geniculate nucleus? - answeropponent process Which of the following is the best description of the current view of how colour is coded in the visual system? - answerIt begins with a trichromatic process and then switches to an opponent process.