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:
Signal center frequency in Hz
The bandwidth of the signal in Hz (only applicable if signal type is Narrowband Noise)
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.
Signal duration (excluding ramps), in ms
Duration of each ramp, in ms
The available choosers are:
Right
, Left
, Both
]The ear to which the signal will be presented
Sinusoid
, Narrowband Noise
]The signal type. If Sinusoid
the signal will be a pure tone, if Narrowband Noise
, the signal will be a narrow-band noise
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:
Signal center frequency in Hz
The bandwidth of the signal in Hz (only applicable if signal type is Narrowband Noise)
Signal level (for constant procedures), or starting signal level (for adaptive procedures), in dB SPL
Signal duration (excluding ramps), in ms
Duration of each ramp, in ms
The available choosers are:
Right
, Left
, Both
]The ear to which the signal will be presented
Sinusoid
, Narrowband Noise
]The signal type. If Sinusoid
the signal will be a pure tone,
if Narrowband Noise
, the signal will be a narrow-band noise
This experiment can be used to measure pure-tone frequency-discrimination thresholds.
The available fields are:
Signal frequency in Hz
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.
Signal level in dB SPL
Signal duration (excluding ramps), in ms
Duration of each ramp, in ms
The available choosers are:
Right
, Left
, Both
]The ear to which the signal will be presented
Measure d’ for the detection of a pure tone in a Yes/No task.
The available fields are:
The frequency of the pure tone signal
Tone duration (excluding ramps), in ms
Duration of each ramp, in ms
Level of the signal in dB SPL.
The available choosers are:
Right
, Left
, Both
]The ear to which the signal will be presented
Dummy experiment to test adaptive procedures
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:
Fundamental frequency of the standard tones.
Lowest F0 in case of F0 roving
Highest F0 in case of F0 roving
Starting F0 difference between standard and comparison stimuli in percent of the standard F0
Maximum F0 difference allowed between standard and comparison stimuli in percent of the standard F0
Width of each harmonic band, in Hz (for Narrowband Noise, and Huggins Pitch).
Width of each harmonic band, in cents (for Narrowband Noise, and Huggins Pitch).
Width of each harmonic band, in ERBs (for Narrowband Noise, and Huggins Pitch).
Interaural time difference of the decorralated frequency bands of dichotic pitch stimuli, in micro seconds
Interaural phase difference of the decorralated frequency bands of dichotic pitch stimuli
Number of delay-add iteration for IRN generation
Gain applied to dealyed version of the signal in IRN generation
Lowest harmonic number
Highest harmonic number
Low frequency cutoff for the filter applied to the tone
High frequency cutoff for the filter applied to the tone
Level of each harmonic in dB SPL.
Spectrum level of the noise used to generate the complex tone (for Narrowband Noise, IRN, and Huggings Pitch).
Tone duration (excluding ramps), in ms
Duration of each ramp, in ms
Low-frequency cutoff for the first noise band
High-frequency cutoff for the first noise band
Spectrum level of the first noise band in dB SPL
If the Noise 1 Type
is pink, its spectrum level is specified relative to this reference frequency
Low-frequency cutoff for the second noise band
High-frequency cutoff for the second noise band
Spectrum level of the second noise band in dB SPL
If the Noise 2 Type
is pink, its spectrum level is specified relative to this reference frequency
Stretch to apply to each harmonic, in percentage of the F0.
The available choosers are:
Right
, Left
, Both
, Odd Left
, Odd Right
]The ear to which the tone will be presented. If Odd Left
, or Odd Right
, the odd harmonics will be
presented to the left, or right ear, respectively. The even harmonics will be presented to the other ear
Sinusoid
, Narrowband Noise
, IRN
, Huggins Pitch
]The type of complex tone. If Sinusoid
, the complex tone will be composed of harmonically related pure tones
If Narrowband Noise
, the complex tone will be composed of harmonically related narrow bands of noise
If IRN
, an iterated rippled noise will be generated. If Huggins Pitch
, a complex dichotic pitch
will be generated by introducing interaural phase decorrelation at harmonically related frequency bands
Sine
, Cosine
, Alternating
, Random
, Schroeder-
, Schroeder+
]Phase relationship between the partials of the complex tone. If Sine
, or Cosine
each partial will
start in sine, or cosine phase, respectively. If Alternating
, even partials will start in sine phase, and
off partials will start in cosine phase. If Random`, each partial will start with a random phase. If ``Schroeder-
,
the partials will be added in negative Schroeder phase. If Schroeder+
,
the partials will be added in positive Schroeder phase.
White
, Pink
, None
]The noise type for the first noise band. If None
, no noise will be presented
White
, Pink
, None
]The noise type for the second noise band. If None
, no noise will be presented
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. If No
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)
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)
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 between
Lower F0 (Hz)
, and Upper F0 (Hz)
. If Yes-Linear
the F0 of the standard tone(s) on each trial is drawn from a
uniform distribution between Lower F0 (Hz)
, and Upper F0 (Hz)
.
Harmonic
, Harmonic Stretched
]If Harmonic
, harmonic complex tones will be generated. If Harmonic Stretched
, inharmonic complex tones
can be generated by increasing the frequency of each harmonic by a fixed amount (F0*stretch)/100.
See Strech %
in the available fields.
Hz
, Cent
, ERB
]Choose whether the bandwidth of the harmonic bands for Narrowband Noise
and Huggins Pitch
tone types is
specified in Hz, cents, or equivalent rectangulat bandwidth (ERB) units.
Add Same
, Add Original
]Specify the algorithm for IRN generation.
NoSpi
, NpiSo
]If NoSpi
the harmonically related frequency bands will be interaurally decorrelated. If NpiSo
the frequency regions
between the harmonically related frequency bands will be decorrelated.
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).
This experiment can be used to measure thresholds for level discrimination.
ABX task for WAV files.
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.
Same-different experiment to compare WAV files.