Tell me more about EPSP?

EPSP is basically Excitatory post synaptic potential. It's an electrical change that occurs in the membrane of of a post synaptic neuron. The change happens as a result of a neurotransmitter, originated from the a pre synaptic neuron that binds to the post synaptic one. 

There is another kind of post synaptic potential which is the Inhibitory potential, better known as the IPSP. If there are more EPSP's than IPSP's, than Action potential would occur in the post synaptic neuron, causing it to release a neurotransmitter that will cause the same processes in the following neuron.

For further reading:

Action Potential     

Source Wikipedia: In neuroscience, an excitatory postsynaptic potential (EPSP) is a temporary depolarization of postsynaptic membrane potential caused by the flow of positively charged ions into the postsynaptic cell. They are the opposite of inhibitory postsynaptic potentials (IPSPs), which usually result from the flow of negative ions into the cell. A postsynaptic potential is defined as excitatory if it makes it easier for the neuron to fire an action potential. EPSPs can also result from a decrease in outgoing positive charges, while IPSPs are sometimes caused by an increase in positive charge outflow. The flow of ions that causes an EPSP is an excitatory postsynaptic current (EPSC).

EPSPs, like IPSPs, are graded (i.e. they have an additive effect). When multiple EPSPs occur on a single patch of postsynaptic membrane, their combined effect is the sum of the individual EPSPs. Larger EPSPs result in greater membrane depolarization and thus increase the likelihood that the postsynaptic cell reaches the threshold for firing an action potential.

If you meant ESP: Extra-Sensory Perception (ESP) is defined as ability to acquire information by paranormal means independent of any known physical senses or deduction from previous experience. The term was coined by Duke University researcher J. B. Rhine to denote psychic abilities such as telepathy, precognition and clairvoyance. ESP is also sometimes casually referred to as a sixth sense. The term implies sources of information currently unexplained by science. Popular belief in ESP is widespread. The existence of ESP abilities is highly controversial, and no scientifically conclusive demonstrations of the existence of ESP have been given.Parapsychology explores this possibility, and some experiments such as the ganzfeld have been suggested as good evidence of ESP.

If you are a believer (like me ;) Read : The Field" by Lyne McTaggart.

McTaggart describes scientific discoveries that she believes point to a unifying concept of the universe, one that reconciles mind with matter, classic Newtonian science with quantum physics and, most importantly, science with religion. At issue is the zero point field, the so-called "dead space" of microscopic vibrations in outer space as well as within and between physical objects on earth. These fields, McTaggart asserts, are a "cobweb of energy exchange" that link everything in the universe; they control everything from cellular communication to the workings of the mind, and they could be harnessed for unlimited propulsion fuel, levitation, ESP, spiritual healing and more. Physicists have been aware of the likelihood of this field for years, McTaggart writes, but, constrained by orthodoxy, they have ignored its effects, which she likens to "subtracting out God" from their equations. But, McTaggart asserts, "tiny pockets of quiet rebellion" against scientific convention are emerging, led by Ed Mitchell, an Apollo 14 astronaut and founder of the Institute for Noetic Sciences, an alternative-science think tank.

Sixth sense or subtle perception ability is our ability to perceive the subtle dimension or the unseen world of angels, ghosts, heaven, etc. It also includes our ability to understand the subtle cause and effect relationship behind many events, which is beyond the understanding of the intellect. Extrasensory perception (ESP), clairvoyance, premonition, intuition are synonymous with sixth sense or subtle perception ability.

 You can test your sixth sense at this website in various ways:

Test your sixth sense

parapsychology