Abstracfi Spectro-temporal influence on N 1-P2 evoked potential thresholds was investigated by manipulating the stimulus risdfall and plateau time and the stimulus type. Thresholds were estimated for two stimulustypes (1000-Hztones, gaussiao noise bursts) and four temporal conditions to compare the effects of rise/fall (2, 16 ins), plateau (4, 32 ins), and total energybased duration. Both physiological and behavioral threshold estimates were measured for each stimulus condition. Results showed

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... hat N1 -P2 and bchaviod thresholds decreased with increasing energy-based duration; however, threshold improvement varied as a function of stimulus type. N 1-P2 thresholds showed greater improvement for noise versus tonal stimuli, whereas behavioml thresholds showed greater improvement for tonal versus noise stimuli. Likewise, behavioral thresholds showed no effect of risdfall time, whereas N 1-P2 thresholds decreased with increasing risdfdl for a sho~4-ins plateau but not for a longer, 32-ins plateau. Theseresultsdemonstratethat spectrwtemporal parametersdifferentiallyinfluencephysiologicaland behaviod estimatesof signal detection.