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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