Default Experiments
Audiogram
This experiment can be used to measure thresholds for detecting a signal in quiet. The signal can be either a pure tone or a narrow-band noise.
The available fields are:
- Frequency (Hz) :
Signal center frequency in Hz
- Bandwidth (Hz) :
The bandwidth of the signal in Hz (only applicable if signal type is Narrowband Noise)
- Level (dB SPL) :
Signal level (for constant procedures), or starting signal level (for adaptive procedures), in dB SPL. If the signal type is narrowband noise the level if the total level, not the spectrum level.
- Duration (ms) :
Signal duration (excluding ramps), in ms
- Ramps (ms) :
Duration of each ramp, in ms
The available choosers are:
- Ear: [
Right
,Left
,Both
] The ear to which the signal will be presented
- Ear: [
- Signal Type: [
Sinusoid
,Narrowband Noise
] The signal type. If
Sinusoid
the signal will be a pure tone, ifNarrowband Noise
, the signal will be a narrow-band noise
- Signal Type: [
Demo Audiogram Multiple Frequencies
This experiment can be used to measure thresholds for detecting a signal in quiet. The signal can be either a pure tone or a narrow-band noise. Several signal frequencies can be tested within the same block of trials.
The available fields are:
- Frequency (Hz) :
Signal center frequency in Hz
- Bandwidth (Hz) :
The bandwidth of the signal in Hz (only applicable if signal type is Narrowband Noise)
- Level (dB SPL) :
Signal level (for constant procedures), or starting signal level (for adaptive procedures), in dB SPL
- Duration (ms) :
Signal duration (excluding ramps), in ms
- Ramps (ms) :
Duration of each ramp, in ms
The available choosers are:
- Ear: [
Right
,Left
,Both
] The ear to which the signal will be presented
- Ear: [
- Signal Type: [
Sinusoid
,Narrowband Noise
] The signal type. If
Sinusoid
the signal will be a pure tone, ifNarrowband Noise
, the signal will be a narrow-band noise
- Signal Type: [
Demo Frequency Discrimination
This experiment can be used to measure pure-tone frequency-discrimination thresholds.
The available fields are:
- Frequency (Hz) :
Signal frequency in Hz
- Difference (%) :
Frequency difference (for constant procedures), or starting frequency difference (for adaptive procedures), between the standard and comparison stimuli. The difference is measured as a percentage of the standard frequency in Hz.
- Level (dB SPL) :
Signal level in dB SPL
- Duration (ms) :
Signal duration (excluding ramps), in ms
- Ramps (ms) :
Duration of each ramp, in ms
The available choosers are:
- Ear: [
Right
,Left
,Both
] The ear to which the signal will be presented
- Ear: [
Demo Signal Detection
Measure d’ for the detection of a pure tone in a Yes/No task.
The available fields are:
- Frequency (Hz) :
The frequency of the pure tone signal
- Duration (ms) :
Tone duration (excluding ramps), in ms
- Ramps (ms) :
Duration of each ramp, in ms
- Level (dB SPL):
Level of the signal in dB SPL.
The available choosers are:
- Ear: [
Right
,Left
,Both
] The ear to which the signal will be presented
- Ear: [
Dummy Adaptive
Dummy experiment to test adaptive procedures
F0DL
Measure thresholds for the detection of differences in fundamental frequency (F0) between two tones. Different tone types are supported, including harmonic complex tones, narrowband-noise complex tones, complex dichotic-pitch tones and iterated rippled noise.
The available fields are:
- F0 (Hz) :
Fundamental frequency of the standard tones.
- Lower F0 (Hz) :
Lowest F0 in case of F0 roving
- Upper F0 :
Highest F0 in case of F0 roving
- Starting Difference (%)
Starting F0 difference between standard and comparison stimuli in percent of the standard F0
- Delta F0 Limit (%)
Maximum F0 difference allowed between standard and comparison stimuli in percent of the standard F0
- Bandwidth (Hz)
Width of each harmonic band, in Hz (for Narrowband Noise, and Huggins Pitch).
- Bandwidth (Cents)
Width of each harmonic band, in cents (for Narrowband Noise, and Huggins Pitch).
- Bandwidth (ERB)
Width of each harmonic band, in ERBs (for Narrowband Noise, and Huggins Pitch).
- ITD (micro s)
Interaural time difference of the decorralated frequency bands of dichotic pitch stimuli, in micro seconds
- IPD (radians)
Interaural phase difference of the decorralated frequency bands of dichotic pitch stimuli
- Iterations :
Number of delay-add iteration for IRN generation
- Gain:
Gain applied to dealyed version of the signal in IRN generation
- Low Harmonic:
Lowest harmonic number
- High Harmonic:
Highest harmonic number
- Low Freq. (Hz):
Low frequency cutoff for the filter applied to the tone
- High Freq. (Hz):
High frequency cutoff for the filter applied to the tone
- Harmonic Level (dB SPL):
Level of each harmonic in dB SPL.
- Spectrum Level (dB SPL):
Spectrum level of the noise used to generate the complex tone (for Narrowband Noise, IRN, and Huggings Pitch).
- Duration (ms) :
Tone duration (excluding ramps), in ms
- Ramps (ms) :
Duration of each ramp, in ms
- Noise 1 Low Freq. (Hz):
Low-frequency cutoff for the first noise band
- Noise 1 High Freq. (Hz):
High-frequency cutoff for the first noise band
- Noise 1 S. Level (dB SPL):
Spectrum level of the first noise band in dB SPL
- Noise 1 SL Ref. (Hz):
If the
Noise 1 Type
is pink, its spectrum level is specified relative to this reference frequency
- Noise 2 Low Freq. (Hz):
Low-frequency cutoff for the second noise band
- Noise 2 High Freq. (Hz):
High-frequency cutoff for the second noise band
- Noise 2 S. Level (dB SPL):
Spectrum level of the second noise band in dB SPL
- Noise 2 SL Ref. (Hz):
If the
Noise 2 Type
is pink, its spectrum level is specified relative to this reference frequency
- Stretch (%)’
Stretch to apply to each harmonic, in percentage of the F0.
The available choosers are:
- Ear[
Right
,Left
,Both
,Odd Left
,Odd Right
] The ear to which the tone will be presented. If
Odd Left
, orOdd Right
, the odd harmonics will be presented to the left, or right ear, respectively. The even harmonics will be presented to the other ear
- Ear[
- Type[
Sinusoid
,Narrowband Noise
,IRN
,Huggins Pitch
] The type of complex tone. If
Sinusoid
, the complex tone will be composed of harmonically related pure tones IfNarrowband Noise
, the complex tone will be composed of harmonically related narrow bands of noise IfIRN
, an iterated rippled noise will be generated. IfHuggins Pitch
, a complex dichotic pitch will be generated by introducing interaural phase decorrelation at harmonically related frequency bands
- Type[
- Phase[
Sine
,Cosine
,Alternating
,Random
,Schroeder-
,Schroeder+
] Phase relationship between the partials of the complex tone. If
Sine
, orCosine
each partial will start in sine, or cosine phase, respectively. IfAlternating
, even partials will start in sine phase, and off partials will start in cosine phase. IfRandom`, each partial will start with a random phase. If ``Schroeder-
, the partials will be added in negative Schroeder phase. IfSchroeder+
, the partials will be added in positive Schroeder phase.
- Phase[
- Noise 1 Type[
White
,Pink
,None
] The noise type for the first noise band. If
None
, no noise will be presented
- Noise 1 Type[
- Noise 2 Type[
White
,Pink
,None
] The noise type for the second noise band. If
None
, no noise will be presented
- Noise 2 Type[
- Fix Spectrum Level[
Yes
,No
] If
Yes
the harmonic level of the comparison tone(s) will be adjusted so that the spectrum level of the standard and comparison tone(s) match. IfNo
the standard and comparison tones will be presented at the same harmonic level, but will have different spectrum levels (e.g. as the F0, and hence the harmonic spacing increase, the spectrum level for a fixed harmonic level decreases)
- Fix Spectrum Level[
- Vary Harm. No.[
Yes
,No
] If
Yes
the number of the lowest and highest harmonics of the comparison tone(s) will be varied to fill the same spectral region as the standard tone(s)
- Vary Harm. No.[
- Roving[
Yes-Log
,Yes-Linear
,No
] If
Yes-Log
, the F0 of the standard tone(s) on each trial is drawn from a distribution that is uniform in log space betweenLower F0 (Hz)
, andUpper F0 (Hz)
. IfYes-Linear
the F0 of the standard tone(s) on each trial is drawn from a uniform distribution betweenLower F0 (Hz)
, andUpper F0 (Hz)
.
- Roving[
- Harmonicity[
Harmonic
,Harmonic Stretched
] If
Harmonic
, harmonic complex tones will be generated. IfHarmonic Stretched
, inharmonic complex tones can be generated by increasing the frequency of each harmonic by a fixed amount (F0*stretch)/100. SeeStrech %
in the available fields.
- Harmonicity[
- Bandwidth Unit[
Hz
,Cent
,ERB
] Choose whether the bandwidth of the harmonic bands for
Narrowband Noise
andHuggins Pitch
tone types is specified in Hz, cents, or equivalent rectangulat bandwidth (ERB) units.
- Bandwidth Unit[
- IRN Type[
Add Same
,Add Original
] Specify the algorithm for IRN generation.
- IRN Type[
- Phase Relationship[
NoSpi
,NpiSo
] If
NoSpi
the harmonically related frequency bands will be interaurally decorrelated. IfNpiSo
the frequency regions between the harmonically related frequency bands will be decorrelated.
- Phase Relationship[
- Dichotic Difference[
IPD Stepped
,IPD Linear
,IPD Random
,ITD
] Choose whether the decorrelation in the target regions will be achieved by applying a costant interaural phase shift (IPD), an IPD shift that is linearly increasing from the low-frequency to the high-frequency edge of the decorrelated frequency band (IPD Linear), a random IPD shift across the decorrelated frequency band, or a costant interaural time difference (ITD).
- Dichotic Difference[
Level Discrimination
This experiment can be used to measure thresholds for level discrimination.
WAV ABX
ABX task for WAV files.
WAV Comparison
This experiment can be used to find out which of three different sounds is judged as the most dissimilar from the other two (the odd one out).
The procedure used is similar to the odd-one-out procedure, however, in this experiment all three sounds are different, while in the odd-one-out procedure two of the sounds are the same, or the physical attribute of interest (e.g. frequency, intensity) is the same between two of the sounds. The task in this experiment is subjective, there is no correct response.
This task was used by Carcagno and Plack [2011, JARO 12: 503–517, DOI:10.1007/s10162-011-0266-3] to test whether listeners would perceive an unresolved complex tone with partials summed in ALT phase as more similar (in pitch) to an unresolved complex tone with the same F0 with partials summed in SINE phase, or to a resolved complex tone with double the F0. The pitch of unresolved complex tones with harmonics summed in ALT phase is generally found to be an octave higher than the pitch of unresolved complex tones summed in SINE phase. Therefore, listeners should choose the 110 SINE stimulus as the odd one out.
WAV Same/Different
Same-different experiment to compare WAV files.