Photoreceptor evoked potentials and phototactic behaviour in cercaria caribbea LXXI cable

Transient potential changes evoked in response to light stimuli, and presumably arising from rhabdomeric eye-spots in the cercarial body, were recorded for the first time, to our knowledge, in helminth parasites. Pigmented Cercaria caribbea LXXI gave a very slowly adapting response to maintained light stimulus, while a non-pigmented variety appeared to emit a stronger, rapidly adapting response to light onset. Swimming towards a directional light source is disrupted by several neurophamacological agents, which presumably disturb synaptic transmission in the nerve/muscle system. The light evoked potentials were unaffected by these same agents and therefore, appeared to be directly recorded receptor potentials.(AU)

Early childhood stimulation programs in Jamaica

Undernutrition and frequent infections are not the only causes of poor development in children living in poverty. These children usually have little in the way of stimulation in their homes (AU)