摘要:

Visual evoked potential (VEP) was analyzed in 24 healthy male volunteers (age: 25–35 years) between 7.00 a.m. and 4.00 p.m. to evaluate possible diurnal variation in hemispheric differences of the response to a diffuse or 1 ° flash and checkerboard pattern-reversal (stimulation: binocular). VEP was recorded over O2–A1 and O2–A2, and 64 exposures were averaged during each session. After diffuse and 1 ° flash stimulation the amplitudes of early components (latencies < 140 ms) were higher over the right hemisphere (O2–A2) than over the left (O1–A1250 ms) exhibited higher amplitudes over the left than over the right hemisphere during the whole experiment. With checkerboard pattern-reversal stimulation such a time-dependent change in the amplitudes of VEP between both hemispheres was not

ISSN:0302-282X    

DOI:10.1159/000117960

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

Besides hypothesis testing, which should be done as sparingly as possible, the measured or observed data should be described as extensively as possible. The traditional reliance on profiles of the mean responses may neglect useful information, and such profiles may also be misleading. With the aid of exploratory data analysis, different aspects of the structure of a data set can be considered. ‘Data snooping’ may discover coherences, non-trivial structures and peculiarities, which lead to a new. hypothesis or to new mathematical-statistical models. It is, in our opinion, a necessity to consider exploratory and confirmatory data analyses in conjunction. This will be illustrated by examples taken from pharmaco-EEG stud

ISSN:0302-282X    

DOI:10.1159/000117961

出版商:S. Karger AG    

年代:1983

数据来源: Karger