The present disclosure provides a rotation estimation device including an acquisition section and a rotation estimation section.

The present disclosure provides a rotation estimation device including an acquisition section and a rotation estimation section.

A stroke decision device 30 includes an acquisition section 31 configured to acquire state information including a position, a velocity, and a rotational velocity of an incoming ball, and a stroke decision section 32 configured to decide a stroke condition including a position, a velocity, and an orientation of a striking implement at a time point when hitting back the ball toward a target arrival position, based on the state information for the ball and the target arrival position when hitting back the ball with the striking implement.

Computer-readable storage media, apparatuses, and methods associated with context dependent reactions derived from human responses are disclosed herein. An apparatus may, in some embodiments, include a communication module and a reaction agent. The reaction agent may be configured to transmit, via the communication module, a request to a remote data source. The request may include context data indicative of an operational context of the apparatus. The reaction agent may receive, in response to the request, via the communication module, reaction data for the apparatus to react to the operational context. In embodiments, the reaction data may be derived from previous observations of human response to a context similar to the operational context indicated by the context data of the request. Other embodiments may be described and/or claimed herein.