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Lab HW 7 due 5/12/14 Homework from CD-rom due 5/12/14 Chapter 11#6 Frequency response of the ear.When you do this experiment first do the calibration. If you are using headphones make sure you don’t have the volume too loud.Then click on series 1, you will hear a man’s voice say trial number and then a very faint tone (you may not hear this for the first few numbers) listen very carefully and record the numbers for the tones that you can actually hear. Repeat this for the other two series. Make a table with your responses. Put series 1, 2 and 3 in columns and trials 1- 9 in the rows, record whether you heard each number with a y for yes and a n for no. According to the graph, which frequencies should be most difficult for you to hear? Do your results confirm this? How does increasing the SPL change your response on your graph? Talk about your responses in terms of being able to hear low, medium and high frequencies (1-9) at the different intensities (series 1,2,3).Trial Series 1 Series 2 Series 31 n y y2 y y y3 y y y4 y y y5 y y y6 y y y7 y y y8 y y y9 y y yQuestions & Answers- According to the graph, which frequencies should be most difficult for you to hear? Do your results confirm this? Frequencies below the audibility curve also known as the threshold of hearing cannot be heard and tones above the threshold of feeling can result in pain. According to the graph the tones that will be most difficult to hear will be those in the low frequency range; those that fall between 20Hz and 100Hz. In other words, I should have had difficulties hearing those tones presented in series 1 trial 1-2. Trial 1 of series 2 possibly and none for series 3. However,my results are not supported by the hearing threshold curve as it can be seen from the table. This could have been due to that my volume was too high but even after adjusting the volumeand repeating the trials for all of the series 1, 2, & 3 I still got the same results. My results at least in series 1 trial 1 do confirm this statement. - How does increasing the SPL change your response on your graph?The difference in dB between series 1 and 2 which was 20 dB made the tones in series 1 trial 1 not detectable. However, the increase of 20dB in series 2 and series 3 made all the tones detectable throughout these two series and their trials. In other words, increasing dB makes the tones more audible from series to series. There was a 20dB difference between all series, thus making the next series louder. Increasing the SPL will change my respond by allowing me to be able to hear more easily the higher frequencies presented as well as the intensities but not for lower frequencies or intensities. - Talk about your responses in terms of being able to hear low, medium and high frequencies (1-9) at the different intensities (series 1,2,3).Being that series 1 had 20dB less than series 2 I was not able to hear in series 1 trial 1 the toneat all but I was able to hear the rest of the frequency tones clearly in this series throughout the rest of the trials which was from 2-9. On series 2 being that it was 20dB greater than series1 I was able to hear all the frequencies presented in this series throughout all the trials. And inseries 3 which was another 20dB greater than the previous series I was able to detect as well all the frequencies presented to me throughout all the trials as well. In series 1 I was not able to detect the 40Hz low frequency tone presented in trial 1 but was able to hear the low frequency tone presented in trial 2 in this series. In series 2 I was able to detect all of the frequencies ranging from low to high under 50 dB and its corresponding frequencies ranging from low 20Hz – 100Hz, medium 200Hz – 1,000Hz, and high . This pattern was similar for series 3 only different was the dB level which was at 70dB. This is due to because higher frequencies and intensities are further away from the audibility curve stated previously than lower frequencies making them more difficult to detect. #12 Masking high and low frequencies.It might take a minute to catch on to the sequencing in this experiment so listen to the sounds and then figure out which is the test tone.Click on 1000 Hz test tone. You will a man say the trial number then you will hear a test tone playing quickly 8 times (along with another continuous tone which is the mask) followed by a very short pause. On each trial, the test tone becomes progressively quieter; make a note of whether or not you hear two sounds or one on each trial. At some point you will only hear the test tone (one note instead of two). Make a note of the point at which you only hear the mask. This means that the test tone is being successfully masked. Now repeat the process for the other tone. Make a table with the frequency in columns and the trial number in rows – and enter your data as to whether or not you could hear the testtone on each trial. Which tone is most affected by the mask? Explain your answer.Trial Frequency 1000Hz (High) Frequency 200Hz (Low)1 Both Both2 Both Both3 Both Both4 Both Both5 Both Both6 Both Both7 Mask Only Both8 Mask Only Both9 Mask Only Both10 Mask Only Mask OnlyQuestion & Answer - Which tone is most affected by the mask? Explain your answerThe tones that are most affected by the mask are the high frequency tones as shown in the table above under 1000 Hz; where after trial 6 I was no longer able to detect the test tone. Compared to low frequency tones such as those tested under 200 Hz and where I was able to hear both the test tone and the mask, masking in these types of trials was not as successful as in the other condition (1000 Hz); the only time I was not able to hear the test tone anymore in the 200 Hz frequency setting was during the last trial. One probable explanation why high frequency tones are most affected by the mask is because high frequency tones cannot travel as far as low frequency tones and they do not reach completely other areas of the ear that arereached by low frequency tones and therefore low frequency tones are more detectable because low frequency tones travel farther than high frequency tones. BEST ANSWER BELLOWAt 600Hz mask affect the High Frequency test tones (1,000Hz) because they both excite thesame receptors this support the place theory of hearing which states that the frequency of asound is indicated by the place along the cochlea at which nerve firing is highest. This theoryalso states that low frequencies cause


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JJC PSY 324 - Chapter 11

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