One-day old domestic chicks ( @entity1573 ) show concentration-dependent behavioural responses to olfactory cues. In the present study we investigated the lateralized olfactory responses of 1-day-old chicks to the odours of @entity4744 and @entity36995 . In experiment 1 different concentrations of each odour were presented in repeated trials to chicks housed individually. The odours were presented together with a small coloured bead at which the @entity1573 pecked. When tested with the highest concentration of @entity4744 (100% v/v), the chicks demonstrated more head shaking when their left nostril was occluded (RN; right nostril in use) than when their right nostril was occluded (LN; left nostril in use). No such lateralization occurred in response to @entity36995 . This result was confirmed in a second experiment in which the chicks were tested with unscented stimuli, 100% @entity4744 and 100% @entity36995 . In experiment 3 we found that occluding both the chicks' nostrils abolished the head shaking response to @entity4744 and to @entity36995 . Thus, the chicks' head shaking responses to the odorants @entity4744 and @entity36995 are mediated primarily by inputs from within the nasal cavity, and not by oral or occular inputs. The present results are consistent with the hypothesis that there is lateralization to olfactory cues and that it is dependent on the involvement of receptors inside the nasal cavity. We suggest that differences in lateralized olfactory responses to different odours are affected by the relative involvement of intranasal olfactory and trigeminal chemoreceptors.

Chemosensory input and lateralization of brain function in the domestic XXXX .

@entity4744 :: ('MESH:D005054', 'Chemical') :: ['eugenol'] @entity1573 :: ('9031', 'Species') :: ['Gallus gallus domesticus', 'chick'] @entity36995 :: ('MESH:C020377', 'Chemical') :: ['iso-amyl acetate', 'isoamyl acetate']
@entity1573 :: (9031,Species) :: ['chick']
