Negative instruction, [250], [253].

[Nerve-forces], directive, [18], [96] f., [164], [205] f., [212] ff.;

in attention, [96], [166];

in perception and idea, [115] ff.;

of reinforcement and inhibition, in attention, [106] ff., [164], [249] f.;

double-acting, [109], [249] f.;

in memory, [190];

in imagination, [199] f.;

in selective action, [248];

in volitional action, [251];