The Company of Biologists

Table 1.

Manipulation of motion variables in the four experiments

		Stimulus parameters
Experiment	Manipulation	Duration	Speed	Acceleration	Amplitude	Reversals	Period	Duty cycle
1	Calibration	-	-	-	-	-	-	-
2	Time scale	+	+	+	-	-	+	-
3	Amplitude	-	+	-	+	+	+	-
4	Speed and duration	+	+	+	-	+	+	+

		Stimulus parameters
Experiment	Manipulation	Duration	Speed	Acceleration	Amplitude	Reversals	Period	Duty cycle
1	Calibration	-	-	-	-	-	-	-
2	Time scale	+	+	+	-	-	+	-
3	Amplitude	-	+	-	+	+	+	-
4	Speed and duration	+	+	+	-	+	+	+

-, Fixed parameter; +, variable parameter.