“…The stretch reflex in the jaw-closing muscles is probably monosynaptic (McIntyre, 1951;Hugelin & Bonvallet, 1956) and there is no convincing evidence of a longer latency stretch reflex during voluntary contraction of the jaw muscles either in the present experiments or in human subjects (Lamarre & Lund, 1975). Thus, the isolated properties of the few elements of the reflex arc might be used to predict the overall behaviour of the reflex (Poppele & Terzuolo, 1968;Rosenthal, McKean, Roberts & Terzuolo, 1970;Stein, 1974 (Matthews & Stein, 1969). In fact, increasing the frequency over the range explored in the present work produced increasingly deep modulation of e.m.g.…”