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Experiment Parameters

ECoS/Win lets you define the conditions of your audio experiments simply by filling in a series of forms. This design makes it possible to carry out the most common types of listening experiments, using different stimulus sets and/or response alternatives, quickly and easily. Some of the conditions which ECoS/Win allows you to define include:
  • the set of audio stimulus files to be included in your experiment
  • the number of times each signal is to be presented during the listening test
  • the number of signals to be presented on each trial of the test
  • the set of response alternatives to be displayed, on the screen, for the listener
  • the sequence of events occuring within a given trial
  • the timing of events within each trial, including the rate of signal presentation
  • the time permitted for the listener to respond whether or not accuracy feedback is to be provided to the listener, and if so in what form
  • the time separating adjacent trials (inter-trial interval)
  • the number of trials per "block" and number of blocks per session
  • the sequence of stimuli (predetermined or random)
In addition, for an adaptive experiment, you can also specify:
  • convergence on 30%, 50% or 70% correct responses using Levitt's algorithm
  • the total number of reversals in the test
  • the number of reversals to be used in the estimate
  • the size of the steps (adjustments) to be used in up to three phases of adaptation (coarse, medium and fine)
  • the number of reversals to occur in each phase
Once these details have been specified, the program will produce an experiment specification file that can be read by the ECoS Controller, and used to run your experiment.

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