Figure 4. Bar charts giving the concentration dependent occurrence (%) of different types of motor activity evoked by: A pilocarpine, B octopamine, C tyramine in leg nerves (i upper charts) and wing muscles (ii lower charts).

Key (leg nerves): white bars: no activity; grey bars: pattern unclear; purple bars: fictive flight; light green bars: swing phase only; dark green bars: fictive walking. Key (wing muscles): white bars: no activity; blue bars: elevator only; red bars: depressor only, purple bars: fictive flight activity. Numbers in parenthesis give the number of preparations for each test group.