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883259

Question | Answer |

Fechners assumption and law | Fechner assumed that jnds were subjectively equal. equal sensation differences correspond to equal stimulus ratios. S=klogI |

Straight line on a log-log scale | indicates a relationship between y and x that is power not logarithmic |

Emperical data gave what type of function on a linear-log scale, and what did that mean? | You get a power relation (curved line), not a logarithmic relation (straight line). This meant that emperical data was incongruous with fechners law |

Steven's power law | S=kI(exponent) Resulting in equal sensation ratios corresponding to equal stimulus ratios |

Exponent tells us? | The relation between the ratios of S & I |

Response linearity | I increases and also S increases at a constant rate |

Response Compression | exponent<1 As I increases, S increases at a decreasing rate |

Response Expansion | exponent > 1 As I increases, S increases at an increasing rate |

Log law is? | An indirect measure of sensory magnitude But also consistent with category scaling (much lighter, lighter, heavier, much heavier) |

Power law is? | A direct estimate of sensory magnitude Handles compression and expansion Versitile |

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