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Table 1.

Testing for a functional window: test at different magnetic intensities

Correct directional choices
Test conditionTests per birdPercentage correct (mean ± s.d.)Individuals with >50% correct choicesSignificant directional preference?Different from C?Latencies (s) (means ± s.d.)
C1, intensity like geomagnetic field 78±13 12/12 *** C1 35.6±35.7 
Intensity 50% decreased 47±16 6/12 n.s. ** 38.9±40.8 
Intensity 50% increased 42±16 4/12 n.s. ** 52.6±68.9 
C2, intensity like geomagnetic field 72±16 12/12 *** C2 28.2±29.1 
Intensity 25% decreased 75±21 11/12 ** n.s. 37.5±32.7 
Intensity 25% increased 50±13 7/12 n.s. 29.6±31.1 
Correct directional choices
Test conditionTests per birdPercentage correct (mean ± s.d.)Individuals with >50% correct choicesSignificant directional preference?Different from C?Latencies (s) (means ± s.d.)
C1, intensity like geomagnetic field 78±13 12/12 *** C1 35.6±35.7 
Intensity 50% decreased 47±16 6/12 n.s. ** 38.9±40.8 
Intensity 50% increased 42±16 4/12 n.s. ** 52.6±68.9 
C2, intensity like geomagnetic field 72±16 12/12 *** C2 28.2±29.1 
Intensity 25% decreased 75±21 11/12 ** n.s. 37.5±32.7 
Intensity 25% increased 50±13 7/12 n.s. 29.6±31.1 

C1 and C2 are the control tests of the two series;column 4 gives the number of individuals with more than 50% correct choices compared with the number of individuals tested; column 5 indicates whether there was a significant preference of the correct axis by the Sign test,indicating oriented behaviour (***P<0.001; n.s., not significant); column 6 indicates whether the distribution of choices was significantly different from that in respective control conditions according to the F-test: *P<0.05; **P<0.01. `Latency' indicates the time, in seconds,between release of the chick and its scoring by moving behind a screen

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