Basic Psychology is about the concepts that are fundamental to the study of human behavior. Memory, Attitude, Perception and Personality are some of these topics.

Basic Psychology also covers the history of the evolution of Psychology as a discipline by chronicling the schools of Psychology such as Psychoanalysis, Behavioral Psychology, Cognitive Psychology et al.

Applied Psychology has to do with the application of these concepts and involves experimentation and psychological intervention. In simple words, Basic Psychology is heavy on theory and Applied Psychology is heavy on experiments and the implementation of Psychological theory to deal with real life issues.

Sensory register, also called sensory memory, refers to the first and most immediate form of memory you have. The sensory register is your ultra-short-term memory that takes in sensory information through your five senses (sight, hearing, smell, taste and touch) and holds it for no more than a few seconds.

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Limitations of Psychological enquiry:

1. Lack of true zero point
   Psychological measurements do not have a true zero point like physical sciences. For example, there is no zero interest, attitude or personality. So the measurements are not absolute, they are relative in nature. Sometimes ranks are also used as scores.
2. Relative nature of psychological tools
   Psychological tests, Questionnaire etc. are not universally applied; they are made for particular context. Tools developed in urban context may not be applied in rural area, also western tests and other tools may not apply elsewhere.
3. Subjective interpretation qualitative data
   The data which can't be categorized or quantified in scores or ranks, runs the risk of subjective (individual, personal) interpretation. Every researcher may give different meanings to data.

The limitations of psychological enquiry are as follows:

Lack of true zero point - Psychological measurements do not have a zero point. The scores that are assigned to individuals in psychological studies are not absolute in nature but have relative value.

Relative nature of psychological tools - Psychological tests need to be developed, modified and adapted according to the context of study. For example, test developed for urban children is not suitable and cannot be applied on tribal children.

Subjective interpretation of qualitative data - The qualitative data are largely subjective and interpretations may vary from one individual to the other.

Introspection means "to look inside," and describes the act of thinking about your own actions or inner thoughts. When you examine what you do, say, think or feel and how it affects your life and the lives of others, that's introspection. It's easy to piece together the meaning of the noun introspection.