Answer:

Psychology is the study of behavior and many can say that it has the first influence on the field of organizational behavior. The main reason is that this field of study deals with studying different human behavior that needs to be explained and understood. Psychologists are the people who study all aspects of human behavior and they aim to predict the different behaviors of different individuals by observing their differences, personality and other aspects related to their personalities and actions. Teaching theorists, personality theorists, counseling psychologists and primary, industrial and organizational psychologists have contributed a lot in the field of Organizational behavior. 

The ff. are some of the role and contribution of psychology in OB:

• It determines the  relationship  of the mental health  and general wellbeing of individuals in relation to their attitude and behavior at work. Psychologists are given access to the working environment of the employees and other aspects that affect the performance and health of each employees. The results of the study made by the psychologists can be used by the company or the organization in their employee assessment, hiring practices and training of employees as well as the newly hired employees.
• Psychology also contributes in the development of performance appraisal of employees. The process usually includes mental health and physical well being assessment and its effects to their work performance. The assessment are used to decide if the employees will be promoted or not or if they need to be transferred to other department.
• Psychology also contributes in the analysis of of the social structure in the organization. It can also be used to develop programs and other trainings that will help employees be motivated and enthusiastic at work. 

Social Psychology aims to study and deal with how certain individuals are affected  by other individuals that they are currently spending time with or those individuals that they imagined to be present at some moment. It aims to investigate how these individuals influenced the thoughts, feelings and behavior of a person. 

• Social Psychology can be very useful to organizations in terms of measuring, understanding and improving the attitude of different employees and it can also help them improve the communication pattern of employees as well as the higher management through proper assessment and study. 
• Social Psychology will help companies in understanding their employees by studying their process of interaction, their culture and how it is influenced by other culture and also their process of learning from their co-employees at work.
• Social Psychologists study different fields and aspects such as  conformity, persuasion, power, influence, obedience, prejudice, discrimination, stereotyping, sexism and racism, small groups, social categories, inter-group behavior, crowd behavior, social conflict, social change and decision making which can be very beneficial on the part of the organization because it can be a very good tool to know and develop different approach to their diverse employees

Sociology
 

•  Sociologists focus more on the study of social systems and the roles of different individuals within that social system. They usually focus on group dynamics.
• One of their major contribution in organizational behavior is their study about the group behavior in organizations. 
•  Sociology contributes to OB by giving clear understanding about the organizational culture, group dynamics, intergroup behavior, communications, corporate technology, bureaucracy, power and conflict. 
• Sociology also helps organizations in their process of hiring competent people whose skills and knowledge can be applied in different and diverse settings and can help different tasks to be done with excellence and good results.

Anthropology is the study and understanding of the relationship of human being and the environment and their cultures. 

• Anthropologists contributes to organizational behavior by helping them understand organizational culture and the differences of these cultures between different countries.
•  Anthropology helps organizations to become familiar with cultural differences of their employees that helps them improve their management style and approach to their different employees. 
• this field of study also contributes in different aspects of cultural settings such as different values of people within the organization, comparative attitudes and cross-cultural analysis
   

Step-by-step explanation

Organizational behavior is a very complex field. It requires different knowledge of various aspects and Psychology, Sociology, Social Psychology and Anthropology are considered as one of those aspects that have great contribution to OB. 

These fields of knowledge are necessary so that a certain organization will be able to come up with the best strategy and approach when it comes to dealing with their employees and to be able to establish the best organizational culture which is very beneficial for both the organization and the employees.

These aspects are very much related to organizational behavior because OB is the study of human behavior in an organizational settings. The application of knowledge in these 4 aspects can help in better understanding and can give more details that will contribute to the study of organizational behavior.