Answer questions 1- 4 based on the following information:

Jack is participating in an experiment in which he has to detect the difference between pairs of tones. All tones are presented at 60 dB SPL. The frequencies of these tones are as follows: 2000-2050 Hz, 2000-2025 Hz, 2000-2010 Hz, and 2000-2002 Hz. For each one of these pairs, Jack responds that the two tones sound different in pitch. When presented next with a 2000-2001 Hz pair, Jack says that the two tones are identical in pitch.

1.  What is being measured here?

  1. Absolute threshold (threshold of detection)
  2. Intensity discrimination
  3. Frequency discrimination
  4. Duration discrimination

2.  What is the standard here?

  1. 60 dB
  2. 2 Hz
  3. 2000 Hz
  4. 2002 Hz

3.  What is Jack’s JND for frequency discrimination?

  1. 1 Hz
  2. 2 Hz
  3. 2001 Hz
  4. 2002 Hz

4.  What is Jack’s Weber fraction for frequency discrimination for the 2000 Hz standard?

  1. 0.0005
  2. 0.001
  3. 2
  4. 1

5.  The Weber fraction for intensity discrimination for a 500 Hz signal presented at 40 dB is 0.1. What is the intensity difference limen?

  1. 0.1 Hz
  2. 4 Hz
  3. 4 dB
  4. 40 dB

6.  Ben’s discrimination threshold for frequency for a 1000 Hz standard presented at 60 dB SPL is 4 Hz. What is Ben’s Weber fraction for frequency discrimination?

  1. 0.4
  2. 0.04
  3. 0.004
  4. 4000

7.  Based on question 6, Ben should be able to detect pitch differences between which of the following pairs of sounds?

a.  1000 -1010 Hz

b.  1000 -1004 Hz

c.  1000- 1002 Hz

d.  Both a and b

ANSWERS

Jack is participating in an experiment in which he has to detect the difference between pairs of tones. All tones are presented at 60 dB SPL. The frequencies of these tones are as follows: 2000-2050 Hz, 2000-2025 Hz, 2000-2010 Hz, and 2000-2002 Hz. For each one of these pairs, Jack responds that the two tones sound different in pitch. When presented next with a 2000-2001 Hz pair, Jack says that the two tones are identical in pitch.

1.  What is being measured here?

  1. Absolute threshold (threshold of detection)
  2. Intensity discrimination

c. Frequency discrimination

  1. Duration discrimination

2.  What is the standard here?

  1. 60 dB
  2. 2 Hz

c.  2000 Hz

  1. 2002 Hz

3.  What is Jack’s JND for frequency discrimination?

  1. 1 Hz

b.  2 Hz

  1. 2001 Hz
  2. 2002 Hz

4.  What is Jack’s Weber fraction for frequency discrimination for the 2000 Hz standard?

  1. 0.0005

b.  0.001 (2/2000)

  1. 2
  2. 1

5.  The Weber fraction for intensity discrimination for a 500 Hz signal presented at 40 dB is 0.1. What is the intensity difference limen?

  1. 0.1 Hz
  2. 4 Hz

c.  4 dB (0.1 = ΔI/40)

  1. 40 dB

6.  Ben’s discrimination threshold for frequency for a 1000 Hz standard presented at 60 dB SPL is 4 Hz. What is Ben’s Weber fraction for frequency discrimination?

  1. 0.4
  2. 0.04

c.  0.004 (= 4/1000)

  1. 4000

7.  Based on question 6, Ben should be able to detect pitch differences between which of the following pairs of sounds?

a.  1000 -1010 Hz (above threshold)

b.  1000 -1004 Hz (at threshold)

c.  1000- 1002 Hz (below threshold)

d.  Both a and b