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Table 2.

Lasting effect of the shadow response

Time interval (s)Mean frequency (Hz)P
0-2.5 31.9±2.9 <0.00001 
2.5-5 31.8±3.6 <0.00001 
5-7.5 29.1±3.1 <0.00001 
7.5-10 26.7±4.4 <0.0011 
10-12.5 26.2±4.5 <0.01 
12.5-15 26.2±5.0 <0.01 
15-17.5 25.9±4.3 <0.01 
17.5-20 26.4±3.6 <0.01 
20-22.5 25.3±2.6 <0.01 
22.5-25 25.7±3.5 <0.01 
25-27.5 23.7±2.1 NS 
27.5-30 23.3±2.6 NS 
Time interval (s)Mean frequency (Hz)P
0-2.5 31.9±2.9 <0.00001 
2.5-5 31.8±3.6 <0.00001 
5-7.5 29.1±3.1 <0.00001 
7.5-10 26.7±4.4 <0.0011 
10-12.5 26.2±4.5 <0.01 
12.5-15 26.2±5.0 <0.01 
15-17.5 25.9±4.3 <0.01 
17.5-20 26.4±3.6 <0.01 
20-22.5 25.3±2.6 <0.01 
22.5-25 25.7±3.5 <0.01 
25-27.5 23.7±2.1 NS 
27.5-30 23.3±2.6 NS 

Values are means ± s.d. (N=15).

The list of mean frequency values of activity potentials during 30 s from the beginning of light-off shows the decrease following the 5 s dark period. P values indicate significant differences of these values when compared to the mean frequency of spontaneous swimming potentials, determined by ANOVA (NS, not significant).

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