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FIGURE 5.4-3 Simultaneous recording of muscle action potentials from the left and right MOT while a vertical stripe was oscillated back and forth (left to right, etc.) in front of the fly. Top trace, IF change of the left MOT spikes; middle trace, IF change of the right MOT spikes; bottom trace, position of the black stripe object. Note the phase difference between the MOT frequency waveforms. (The stripe measured 90 x 7 mm, and was 11.5 cm from the eye. Thus, its width subtended 3.5° to the fly. Stripe oscillations were ±15° an 1 Hz. (From Qi, 1989. With permission.)

FIGURE 5.4-3 Simultaneous recording of muscle action potentials from the left and right MOT while a vertical stripe was oscillated back and forth (left to right, etc.) in front of the fly. Top trace, IF change of the left MOT spikes; middle trace, IF change of the right MOT spikes; bottom trace, position of the black stripe object. Note the phase difference between the MOT frequency waveforms. (The stripe measured 90 x 7 mm, and was 11.5 cm from the eye. Thus, its width subtended 3.5° to the fly. Stripe oscillations were ±15° an 1 Hz. (From Qi, 1989. With permission.)

left

FIGURE 5.4-4 Responses of both muscles to triangular motion of the vertical stripe object. Top trace, IF change of the left MOT spikes; middle trace, IF change of the right MOT spikes; bottom trace, position of the black stripe object. Experimental conditions the same as in Figure 5.4-3, except stripe moved in a triangular waveform. Note that the MOT IF waveforms look like the sum of a square wave and a triangle wave, suggesting a proportional plus derivative response. The apparent 180° phase shift between left and right MOT IF suggests that as the stripe is moving right, the right eye is tracking laterally (to the right), and the left eye is tracking medially (also to the right), and vice versa. (From Qi, 1989. With permission.)

FIGURE 5.4-4 Responses of both muscles to triangular motion of the vertical stripe object. Top trace, IF change of the left MOT spikes; middle trace, IF change of the right MOT spikes; bottom trace, position of the black stripe object. Experimental conditions the same as in Figure 5.4-3, except stripe moved in a triangular waveform. Note that the MOT IF waveforms look like the sum of a square wave and a triangle wave, suggesting a proportional plus derivative response. The apparent 180° phase shift between left and right MOT IF suggests that as the stripe is moving right, the right eye is tracking laterally (to the right), and the left eye is tracking medially (also to the right), and vice versa. (From Qi, 1989. With permission.)

left and right MOTs. When the stripe is on the left, the right eye cannot see it, and vice versa. Because of the extra mass of the stripe, the galvanometer pen motor used to move it exhibited a damped overshoot when slewing to the right or left in response to the input square wave. Figure 5.4-6 shows the details of the

5 Hz left

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