Abstract
Acoustic startle reactivity and stabilimetric activity at five background noise levels, from 30 to 90 dB (SPL), were assessed in five rats. A typical biphasic function for the startle reflex resulted as amplitudes first increased with more intense noise levels to an optimal value and then declined. Activity was an increasing linear function of background noise level. The midline cortex was then ablated from the frontal poles to the level of the crossing of the anterior commissures. In a posttest, overall startle reactivity was increased but the biphasic reflex function was maintained. Activity measures did not change. Evidently, frontal midline cortex is not a necessary part of the forebrain system subserving the arousing consequence of background noise level.
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