M. Penttonen et al., UNILATERAL MEDIAL FOREBRAIN-BUNDLE ACTIVATION SELECTIVELY ENHANCES CONDITIONED ORIENTING HEAD TURNS AND IPSILATERAL CINGULATE CORTEX EVOKEDFIELD RESPONSES IN CATS, Psychobiology, 22(1), 1994, pp. 22-30
Effects of a unilateral medial forebrain bundle (MFB) stimulation unco
nditioned stimulus (US) on conditioned head turn and bilateral cingula
te cortex field potentials were studied in cats. Conditioned stimuli (
CSs) of different frequences were given randomly to either ear. The CS
+ was followed by the US, and the CS- was presented alone. Before cond
itioning most cats predominantly turned toward the ear to which the CS
s were presented, whereas after conditioning the head turns were in on
e direction, most prominently contralateral to the US. Negative field
potentials were greater in the cingulate cortex ipsilateral to the US
than in the cingulate cortex contralateral to the US. Cross correlatio
ns indicated similarities between the waveforms recorded for the CS an
d the US within each cingulate cortex, but differences between the two
sides of the cingulate cortex. It is suggested that the unilateral MF
B system has brain side specific effects on conditioned orienting head
turns and cingulate cortex neuronal activity.