Psychophysics: The Fundamentals

By George A. Gescheider | Go to book overview

7
Procedures of TSD

The procedures of TSD are designed to provide the psychophysicist with data in the form of response proportions that can be readily converted into the theoretical constructs of sensitivity, criterion, distribution variance, and distribution shape. TSD can be tested by comparing the values of the constructs predicted from the theory with those that are derived from response proportion data. In those circumstances where the data support the applicability of TSD, the theory can be used to solve many empirical problems. The situation in which a variable is found to have a large effect on response proportion is illustrative. By converting response proportion data into theoretical terms such as d′, AZ, C, and β an investigator can determine whether the effect was due to changes in the observer's sensitivity, criterion, or both sensitivity and criterion. Today, there are several basic procedures of TSD used to solve such problems in psychophysics.


SOME BASIC PSYCHOPHYSICAL PROCEDURES OF TSD

The Yes--No Procedure

With the yes--no procedure observers are given a long series of trials, usually more than 300 in a session, in which they must judge the presence or absence of a signal. Some proportion of the trials is SN, and the remaining proportion is N. At the start of the session, the observer is usually told

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Psychophysics: The Fundamentals
Table of contents

Table of contents

  • Title Page iii
  • Contents vii
  • Preface ix
  • Acknowledgments x
  • 1- Psychophysical Measurement Of Thresholds: Differential Sensitivity 1
  • 2- Psychophysical Measurement Of Thresholds: Absolute Sensitivity 16
  • 3- The Classical Psychophysical Methods 45
  • 4- Classical Psychophysical Theory 73
  • 5- The Theory of Signal Detection 105
  • 6- Further Considerations of Tsd 125
  • 7- Procedures of Tsd 142
  • 8- Some Applications of Tsd 166
  • 9- The Measurement of Sensory Attributes And Discrimination Scales 183
  • 10- Partition Scales 207
  • 11- Psychophysical Ratio Scaling 231
  • 12- Evaluation of Ratio Scaling Methods 264
  • 13- The Psychophysical Law 296
  • 14- Some Fundamental Issues In Psychophysical Scaling 327
  • Conclusion 369
  • Appendix 371
  • Glossary 392
  • References 408
  • Author Index 425
  • Subject Index 431
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