Declarative Memory

Memory is the ability of an individual to record sensory stimuli, events, information etc and retain them over short or long periods of time and recall the same at a later date when needed [1]. Memory has a vital role in human life, as without it, one cannot lead a normal life. Memory is classified into two - long term memory and short term memory. Accordingly long term memories are those that we can recall days, months or years after they were originally stored. Short term memory- memories are those that last seconds to hours and are vulnerable to disruption [2]. Memory can be broadly classified into declarative and non-declarative memory. Memory of facts and events are examples of declarative memory. Declarative memory can be further

The bark is reddish-brown. Its leaves are digitate, with five lanceolate leaflets, sometimes three. Each leaflet is around 4 to 10 cm (1.6 to 3.9 in) in length, with the central leaflet being the largest and possessing a stalk. The leaf edges are toothed or serrated and the bottom surface is covered with hairs. The numerous flowers are borne in panicles 10 to 20 cm (3.9 to 7.9 in) in length. Each is around 6 to 7 cm (2.4 to 2.8 in) long and is white to blue in color. The petals are of different lengths, with the middle lower lobe being the longest. Both the corolla and calyx are covered in dense hairs [50, 51].

Geographical source

Vitex negundo is native to tropical Eastern and Southern Africa and Asia. It is widely cultivated and naturalized elsewhere. Countries it is indigenous to include Afghanistan, Bangladesh, Bhutan, Cambodia,China, India, Indonesia, Japan, Korea, Kenya, Madagascar, Malaysia, Mozambique, Myanmar, Nepal, Pakistan, Philippines, Sri Lanka, Taiwan, Tanzania, Thailand, and Vietnam [50]. It is grown commercially as a crop in parts of Africa, Europe, North America and the West Indies [52]. It is common in waste places around villages, river banks, moist localities and in the deciduous forests [53] .

PHYTOCHEMICAL

Synaptic connection from DG to CA3: Granule cells of the DG give rise to the mossy fibers (unmyelinated axons of the granule cells) that terminate within stratum lucidum, on the proximal dendrites of the CA3 pyramidal cells of the hippocampus. This is known as the mossy fibre pathway. The granule cells also synapse on the polymorphic layer, which sends associational connections to other levels of the DG. Some of the CA3 cells contribute axon collaterals to the deep or polymorphic layer of the dentate gyrus, these axon do not innervate the granule cells. The CA3 field, in turn, gives rise to the Schaffer collaterals that innervate the CA1 field of the hippocampus. This is known as the Schaffer collaterals